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We've covered hundreds of miles in 14 different running hydration vests from Nathan, Salomon, Ultimate Direction, and more to find the best pack out there
Our top hydration packs for running all lined up and ready to go.
Credit: Jeff Colt
By Jeff Colt ⋅ Review Editor ⋅ Updated October 14, 2025
Staying properly hydrated while running is key; the longer the run, the greater the need for a useful hydration pack. A comfortable, functional, and bounce-free vest or belt can make all the difference in upping your running game.
Since 2015, we've been testing running hydration packs, with more than 40 packs in our past. We assess the hydration systems, comfort, features, pockets, and more to determine which options are best for each adventure. We ran with more than 14 packs in hot-weather fun runs to chilly ultra-marathons to separate the impressive from the mediocre.
We love the durable and comfortable Ultimate Direction Ultra Vest 6.0. It has enough storage to be functional and a form-fitting design that we loved. If your budget is smaller, the Salomon Active Skin 4 is a compelling, high-performing vest.
Running doesn't require a ton of gear—that's the beauty of it. However, a few well-considered accessories can elevate your experience and make it better. From men's running shorts to breezy shirts to the ever-essential running shoes, we can help you find the best of the best for your next run.
Editor's Note: This review was updated in October 2025.
Carrying Capacity: 10.3 Liters | Water Storage Options: Two 0.5-liter Body Bottle III Soft Flasks (Included), Reservoir Compatible Up to 2.0 Liters
When we put on the Ultimate Direction Ultra Vest 6.0, everything just clicked. It's more durable and rugged than competitors, plus, it is comfortable, and can carry lots of gear with its 10.1-liter capacity. The simple design has thoughtfully integrated features that make the pack as intuitive as it is useful. Waterproof pockets and tough material will keep you and the vest running for years, with soft trim edges to prevent chafing, and a fine micro mesh interior that is comfortable against exposed skin. Add in a top-notch hydration system, and it's clear to see why we reached for the Ultra Vest 6.0 over and over again. The included 500 mL soft flasks are enough for shorter runs, and the pack is compatible with a full 2 L bladder for longer days.
The dual fit systems on the Ultimate Direction Ultra Vest 6.0 provide enough adjustments to work for various body types and gear assortments and layers, but we found the sizing runs large. If you like going on hikes with your dog and need to carry extra supplies, this pack is easy to use and comfortable. If you plan to cover significant distances on backcountry trails, take a look at the durable and well-featured Black Diamond Distance 15 or Salomon ADV Skin 12.
Carrying Capacity: 4.0 Liters | Water Storage Options: Two 0.5-liter Soft Flasks (Included), Reservoir Compatible Up to 1.5 Liters
The Salomon Active Skin 4 significantly outperforms every other entry-level vest in our tests, with a fit and finish we typically find on higher-end options. This vest has a stretchy, form-fitting build, integrated pouches, and soft-touch materials. It's feature-rich and easy to use without having to stop mid-run to find your next gel. In addition to the large zippered pocket, the pack comes with elastic bungees that you can strap into any configuration using the attachment loops dispersed around the body of the vest. So, despite the advertised 4-liter capacity, we were able to pack snacks, hydration, a hardshell jacket, a med kit, a headlamp, and gaiters. Two 500-milliliter soft flasks are included, but it's also compatible with an additional 1.5-liter reservoir, but it would take up valuable real estate in the back pocket.
This pack doesn't do as well when heavily loaded, for example, as it tends to sag, and we felt it in our shoulders. It also has no integrated pole-holders, but you have to configure some using the bungee straps. There are better options for serious capability, like the extremely comfortable but much larger (and pricier) Salomon ADV Skin 12. But for runners who don't need to pack everything and the kitchen sink on their back, the performance of the Salomon Active Skin 4 is extremely hard to beat for the price.
The Active Skin 4 has plenty of capacity and top-notch comfort for a very reasonable price.
Carrying Capacity: 12 Liters | Water Storage Options: 1.6-liter Insulated Hourglass Reservoir (Included), Two Soft Flasks Up to 0.53 Liters/Each
The Nathan Pinnacle 12L doesn't have the largest capacity, but it is unmatched in the amount of gear it keeps accessible while running. Thirteen pockets and a hydration sleeve for a bladder provide nearly exhaustive storage, and the compatibility with soft flasks adds versatility. The number of pockets is impressive, but the side-accessed kangaroo pockets are immense, and one is also accessible from the top back for more rapid access at aid stations or when you're taking a break. Few other options can compare with its combination of extreme comfort, smart design features, and excellent volume-to-weight ratio. The slightly smaller Ultimate Direction Ultra Vest 6.0 comes the closest, and the Salomon ADV Skin 12 is just a hair behind.
While the Nathan Pinnacle 12L vest is pricy and made of lightweight, less durable fabric, there is value in a 12-liter vest that helps you avoid stopping to access the main storage pockets. As with many vests, we were disappointed with the lack of trekking pole storage. If you store poles in the vertical kangaroo pocket, you can technically access them, but it's not a well-tuned system. Otherwise, we had very few issues with the Pinnacle 12; sure, the sternum straps are a bit stiffer, and a vest like the Salomon ADV Skin 12 is lighter weight, but we know the soft, wrap-around Pinnacle is reliable. The Black Diamond Distance 15 should be your next stop if you need more capacity. Still, the Pinnacle manages to stand out among the competition every time.
Carrying Capacity: 12 Liters | Water Storage Options: Two 0.5-liter Soft Flasks (Included), Reservoir Compatible Up to 1.5 Liters
The Salomon ADV Skin 12 continues to be our favorite large capacity pack for massive days or when you need to carry more layers. It is our go-to for long ultras or personal goals, thanks to the substantial carrying capacity and accessibility. Multiple layers of back storage with a zippered stretch pocket are excellent for warm layers, while the front pockets can easily handle a day's worth of food and water. The compressible fabric allows the vest to conform and expand to different load sizes while maintaining a snug, secure fit. It is easy to stuff full rain and insulating layers with room to spare, and Salomon continues to provide the best hydration bottles with easy in and out. Multiple attachment points also allow the user to customize their pole-carrying experience with the included bungees.
To get such a secure system, Salomon has implemented many different pockets to maintain tension on the ADV Skin 12. For more carefree running and/or fuller loads, this can feel overwhelming, and you must maintain organization or your gear can get lost. Given the stretchy nature of the pack, it is also a bit too easy to overpack. While we experienced no durability issues, the zippers and face fabric are very thin, and care must be taken to avoid breaking or snagging the materials. Users who want a slightly more accessible 12L of capacity should consider the Nathan Pinnacle 12L. When your run calls for something slightly smaller but no less functional, you can't go wrong with the Ultimate Direction Ultra Vest 6.0. Overall, if you have dreams of tackling a race or course without aid stations, then the ADV Skin 12 is the pack we'd recommend.
Carrying Capacity: 15 liters | Water Storage Options: None Included, Compatible with Reservoir Up to 2 Liters or Two Soft Flasks
The Black Diamond Distance 15 is our top choice for speedy overnight trips and self-supported ultra runs. With its single spacious compartment, packing irregularly shaped items is a breeze. The pack's rigid outer material and padded back panel maintain the pack's shape, preventing any unwanted ballooning. The unique dual pole storage options also offer distinct benefits. We recommend this pack for those who plan to cover distance and will maximize its ample space, although you should keep in mind that the more open design may result in some bouncing of internal contents. The Distance 15 comfortably carries up to 10 pounds while running.
Fifteen liters is a substantial amount of room, so users not looking to take advantage of the space should opt for a smaller pack. If you don't need much capacity, check out the Salomon ADV Skin 12, which is equally ready for rugged adventures, or Black Diamond, which has an 8-liter version of this pack, with similar features. However, for packing hard-sided items while running, the Black Diamond Distance 15 cannot be beat, and while it is expensive, it does some niche activities very well.
Carrying Capacity: 2 Liters | Water Storage Options: One 0.65 Liter Soft Flask With Locking Cap (Included), Compatible with One Additional 0.65 Liter Soft Flask
The Raide Research LF 2L has quickly become our go-to for trail adventures because it is the most comfortable. Designed to sit snugly around your waist and hips, this belt manages to go unnoticed, even on long runs. No other belt we've tested managed to remain comfortable for long distances, eventually rubbing around our hip bones. When fully loaded, it doesn't bounce. That's huge. No other hydration system we've tested (vests included) boasts this level of bounce resistance. The belt has loops for poles, small pockets for trash and gels, larger pockets for snacks and a phone, a zippered pouch for keys, and a large pouch for the soft flask. It sells with one flask only, but can fit two.
We love this belt, but accessing your water while running is awkward, requiring you to reach behind you and pull out the soft flask. Also, putting on the belt is like pulling on a pair of pants. We were between sizes and ordered down, which helps with comfort and bounce resistance, but makes putting the belt on tougher. Finally, for a belt, it isn't cheap, on par with many higher-end hydration vests. However, at the end of the day, if you value comfort and dislike wearing a vest, we think you will love this belt. And while it is marketed to mountain athletes, we think this belt is a great choice for road runners as well.
The Raide belt is our go to pack for most runs - it has plenty of storage for hydration and calories with minimal bulk.
Credit: Nathaniel Bailey
Compare Product Specifications
Specifications
Ultimate Direction Ultra Vest 6.0
Nathan Pinnacle 12L
Salomon ADV Skin 12 Set
Black Diamond Distance 15
Salomon Sense Pro 5
Patagonia Slope Runner
Salomon Active Skin 4
UltrAspire Bronco Race
Raide Research LF 2L
Nathan VaporAir 3.0
Nathan Quickstart 2.0 6L
REI Co-op Swiftland 5
UltrAspire Speedgoat 3.0 Waist
Osprey Duro LT
Awards
Best Overall Men's Running Vest
Best for Access on the Move
Best for Going the Distance
Best for Technical Overnights
Best Bang for the Buck
Best Hydration Belt
Measured Weight (Without Hydration System)
6.5 oz
7.5 oz
9.0 oz
12.8 oz
4.9 oz
6.0 oz
6.9 oz
7.1 oz
5.2 oz
10.3 oz
7.7 oz
9.5 oz
7.3 oz
6.9 oz
Advertised Carrying Capacity (Volume by Liter)
10.3 L
12.0 L
12.0 L
15.0 L
5.0 L
3.0 L
4.0 L
5.0 L
2.0 L
7.0 L
6.0 L
5.0 L
1.8 L
0.5 L
Advertised Included Liquid Capacity (Volume by Liter)
1.0 L
1.6 L
1.0 L
1.0 L
1.0 L
1.0 L
1.0 L
1.0 L
0.7 L
2.0 L
1.5 L
1.5 L
1.1 L
0.7 L
OGL Volume-to-Weight Ratio (Bigger Is Better)
1.58
1.60
1.33
1.17
1.02
0.50
0.58
0.70
0.38
0.28
0.78
0.52
0.24
0.07
Total Number of Pockets (Including Hydration)
11
14
13
10
7
6
7
8
7
9
6
9
6
6
Included Water Storage
Two 0.5 L Body Bottle III soft flasks
1.6 L insulated hourglass reservoir
Two 0.5 L soft flasks
None
Two 0.5 L soft flasks
Two 0.5 L HydraPak Flasks
Two 0.5 L soft flasks
None
One 0.65 L soft flask with locking cap
2 L reservoir
1.5 L resevoir
1.5 L HydraPak Elite resevoir
Two 0.55 L UltraFlask Hybrid Bottles
Two 0.36 L Hydraulics soft flasks
Optional Water Storage (Not Included)
Reservoir compatible up to 2.0 L
Two soft flasks up to 0.53 L/ea
Reservoir compatible up to 1.5 L
Reservoir compatible up to 2 L and two soft flask pockets
None
None
Reservoir compatible up to 1.5 L
Reservoir compatible up to 1 L and two soft flask pockets up to 0.55 L/ea
Fits one additional 0.65 L soft flask (in back pocket)
Two soft flask pockets up to 0.65 L/ea
One soft flask pocket up to 0.65 L
Two soft flask pockets up to 0.5 L/ea
None
None
Available Pockets
2 cinched flask/stash pockets, 2 front stretch pocketes, 1 water-resistant chest zip pocket, 1 water-resistant shoulder stash pocket, 2 rear lat zip pockets, 1 water-resistant back zip main compartment, 1 back stash pocket, 1 rear reservoir sleeve
4 front flask/stash pockets, 2 water-resistant chest zip pockets, 1 interior key/pill pocket, 2 side stash pockets, 1 back stash pocket with velcro tab, 2 rear kangaroo stash pockets (1 side access and 1 side + vertical access), 1 large back diagonal zip pocket, 1 reservoir compartment with velcro tab
2 bilateral front flask/stash pockets with elastic loops, 2 bilateral side stretch pockets, 2 bilateral front zip pockets, 2 shoulder stretch pockets, 1 interior trash pocket, 1 large back zip compartment, 1 rear dual-entry tunnel pocket, 1 top stretch pocket, 1 insulated rear reservoir sleeve with hook
2 soft flask/stash pockets, 2 stretch shoulder strap pockets, 1 zip pocket, 1 reservoir compartment with hook, 1 internal zip pocket with key clip, 2 pole sleeves, 1 main cinch-closure compartment
2 front flask/stash pockets with elastic loops, 2 front zip pockets, 1 zip shoulder pocket, 1 back stash compartment, 1 rear dual-entry tunnel pocket
2 front flask/stash pockets, 2 front stretch pockets, 1 back zip pocket, 1 rear dual-entry tunnel pocket
2 front flask/stash pockets with elastic loops, 1 front zip pocket, 2 front stretch pockets, 1 rear reservoir compartment with hook, 1 back zip compartment
2 front flask/stash pockets with elastic loops, 2 front stretch pockets, 2 side "saddlebag" pockets, 1 back pocket, 1 rear zip reservoir compartment
1 large back flask/stash pocket, 1 zip pocket inside the back pocket,
1 dual-entry front stash pocket, 4 interior front slot pockets
2 front flask/stash pockets, 2 front stretch pockets, 2 front zip pockets, 1 back zipper pocket, 1 back dual-entry tunnel pocket, 1 reservoir compartment
1 front flask/stash pocket, 1 front stash pockets, 1 front zip phone pocket, 2 back storage pockets, 1 reservoir sleeve with velcro hooks
2 front flask/stash pockets, 2 front stretch pocket, 1 main zip compartment, 1 reservoir sleeve with lash, 2 small interior mesh slip pockets, 1 rear stash pocket (Fall 2024 Update: 1 front zip pocket replaced 1 front stretch pocket)
2 insulated hydration holsters, 1 rear zip pocket, 2 holster stash pockets, 1 front stash pocket
2 front flask/stash pockets,
2 front stash pockets, 1 zip phone/chest pockets,
1 back dual-entry tunnel pocket
External Storage Options
Back bungee
None
Dual-side bungee
Dual-side bungee
None
None
Back bungee
None
Rear elastic cinch cords
Shoulder and back bungees
Back bungee
Elastic lash loops
Front elastic cinch cords
Lash loops
Pole Holders
4 hooks and bugee loops (front or back closure)
1 vertical entry rear kangaroo pocket
Elastic bungees and loops (front and rear options), custom quiver compatible
2 side storage sleeves, dual piolet compression laces
Elastic cords and loops (front and rear options), custom quiver compatible
Elastic cords and loops (front and rear options)
Custom quiver compatible
None
Rear elastic cinch cords
2 side storage loops
None
4 PackMod Bungee-compatible loops at back
Front elastic cinch cord Z-pole attachments
None
Extra Features
Comfort cynch system, adjustable torso straps, bungee loop for flask, shoulder port for hose, key clip
Pinnacle 4 L (1.2 L), Pinnacle Featherlite 1.5 L (0.4 L)
ADV Skin 5 L (1 L)
Distance 4 L (1 L), Distance 8 L (none) Distance 22 L (none)
Sense Pro 6 Limited Edition Courtney 6L (1 L)
Slope Runner Exploration Pack 18 L (1 L)
Active Skin 8 L (1 L), Active Skin 12 L (1 L)
Big Bronco 12 L (none)
N/A
VaporAir Lite 4 L (2L)
Quickstart 2.0 3 L (1.5 L)
N/A
N/A
Duro 1.5 L (1.5 L), Duro 6 L (1.5 L). Duro 15 L (2.5 L)
Gender Specific or Unisex
Men's (women's model available)
Men's (women's model available)
Men's (womens model available)
Men's (women's model available)
Unisex
Unisex
Unisex (women's model availale)
Unisex
Unisex
Men's (women's VaporAiress 3.0 7L available)
Unisex
Unisex (women's model available)
Unisex
Men's (women's models available)
Hydration packs are a great low-profile way to carry water, layers, and snacks on long runs.
Credit: Jeff Colt
How We Tested
Over the last decade, we've tested countless vests. Our testing begins with identifying the best hydration packs for a wide range of running adventures. We weigh all the packs and spend hours running with different gear setups to explore performance for many adventures. We assess features and functionality for all kinds of runners from dabblers, to top atheltes running short jaunts to ultra-endurance races. In addition to our daily trail runs through the Elk Mountains, Sierra Nevada, or the landscapes of Utah and Montana, we tested these vests in some ultras, including the Jemez Mountain 50 (NM), Western States 100 Miler (CA), and IMTUF 100 (ID) mile race.
Our testers covered miles and miles, examining and using each pocket, feature, and strap with a full load (and then again, with far less) to be sure we had a full understanding of each pack's capabilities.
Credit: Nathaniel Bailey
Our hydration pack for running testing is divided into five metrics:
Comfort (30% of overall weighting)
Features (25% weighting)
Hydration System (15% weighting)
Volume to Weight Ratio (15% weighting)
Pockets (15% weighting)
We also consider what type of runner each pack will perform best for, what type of running it is designed for, and how it stacks up on the trail. We wanted to give each hydration pack a fair shake, so we spent months doing a lot of running. We took these packs everywhere we went, from the high alpine to our local trails and then to the farmer's market.
Why Trust GearLab
Our team of endurance athletes has tested these packs over the years. Our team includes Jeff Colt, Nathaniel Bailey, and Matthew Richardson. They've all put in some serious time, chugging away on races ranging from 10 to 100 miles. Jeff competes internationally in trail races from 50k to 100 miles and trains locally in Colorado's Elk Mountains. Nathaniel is a USA Track and Field certified coach and regularly competes in shorter distances on and off-road. Matthew has run over all the Southwest, finishing in the top 10 of several ultra races.
We put these packs through the wringer, testing them in mountain ranges throughout the western United States.
Analysis and Test Results
To uncover the best packs, we paid attention to how user-friendly the hydration systems are, and compared their overall comfort, fit, and weight.
Worse Value
Better Value
What's the Best Value?
The price of products in this review varies quite a bit. The more affordable vests generally have fewer bells and whistles: these are user-friendly, simple packs to help you drink water on the go. The more expensive packs have more specialized materials, more storage options, and designs targeting running comfort and convenience. “Value,” as far as we're concerned, is a function of price as it relates to performance. A pack may be cheap and crappy, or it may be a great deal that functions nearly as well as the most expensive pack. Generally, the more expensive packs have more to offer and are constructed of higher-end materials that better suit and reflect the natural movements of running.
Sometimes, a simple pack with limited yet high-performing features is actually the perfect choice, ideal for shorter runs when less is more.
Credit: Matthew Richardson
The Salomon Active Skin 4 sits in a league of its own when it comes to value. Following it is the REI Co-op Swiftland 5. It's a great value for the price, offering a snug, comfortable fit and storage room for most outings in the mountains. The Salomon ADV Skin 12 Set is also a great value, with stellar comfort and the ability to seemingly never run out of storage space.
To properly test value, if a pack made a claim, we tried to test it. Four season durability? No problem.
Credit: Jeff Colt
Comfort
Comfort is king. The number-one most important metric to consider when picking a hydration pack for running is comfort. If your pack is causing chafing, rubbing, or discomfort, you're less likely to use it and maybe even less likely to hit the trails for the long missions you've been scheming.
The most comfortable contenders are the ones that use an elastic and stretchy material to hug the body or use stretch in conjunction with static adjustable straps. Packs constructed of inflexible material that merely used static webbing for adjustments didn't perform as well. While straps, especially on the sides, allow for greater adjustability, they also rub and chafe more. Additionally, packs that include shoulder adjustment straps tend to be more comfortable than those without because of the fine-tuned fit.
The most comfortable vest models we tested are the ADV Skin 12 Set and the Black Diamond Distance 15, both are larger packs that really hone in on suspension and gear-carrying ability. Among smaller capacity designs, the more classically styled Patagonia Slope Runner impressed us with its super comfortable compressive design. The Raide Research LF 2L also took top marks for comfort thanks to its minimal and extremely well-thought-out belt design.
The ADV Skin 12 has unbeatable comfort with thin stretch material that provides structure without bulk. The middle, top, and bottom are evenly tensioned, unlike other packs that place the tensioning device towards the bottom. The Black Diamond Distance 15 main compartment has a conventional backpack shape, but it is efficient at moving and limiting bounce. Black Diamond incorporated wider shoulder straps and a thin harness that conforms to the body. The Arc'teryx Norovan 7 utilizes exceptionally light and breathable materials that hug your body for a very comfortable fit that is easy to dial in.
The Nathan Vapor 3.0 is great for those who only use hydration bladders, allowing for additional upfront storage without flasks in the way.
Credit: Matthew Richardson
The key feature that makes the Raide Research LF 2L so comfortable is its elastic design, which completely mitigates bounce. Even at high speeds, the belt doesn't bounce. The wide surface area, integrated load-lifters, and tension belt allow for a snug fit. Both the Patagonia Slope Runner and the Ultimate Direction Ultra Vest 6.0 combine static and elastic straps. The Patagonia features two fixed P-cord chest straps and two elastic straps running across the back. The Ultra Vest features two static sternum straps with lateral stretch fabric.
A lightweight and stretchy vest tends to be best for fast and light adventures, but most tend to be less comfortable when heavily loaded.
Credit: Nathaniel Bailey
The most uncomfortable packs are the Osprey Duro LT and the UltrAspire Speedgoat 3.0 Waist Pack. The Speedgoat bounces significantly at higher speeds, and the hard flasks can dig in. The Osprey lacks much customization for fit, leaving it to chafe if it isn't fitted properly or the pockets aren't full.
If you're somewhere like the desert where food, water, and shade are hard to come by, a hydration vest is going to be the key to a happy run. Shown here is the Patagonia Slope Runner.
Credit: Jeff Colt
Features
It's critical that hydration packs balance a rich feature set and high functionality. All of the bells and whistles are only great if they are useful and don't detract from effectively carrying food, water, and gear while running.
The most feature-packed packs include the Ultimate Direction Ultra Vest 6.0 and the Nathan Pinnacle 12L. The Ultra Vest 6.0 offers elastic straps that clove-hitch to different webbing tabs. The Pinnacle 12 has many useful features, like a storm whistle, reflective banding, and even a place to put your trekking poles.
Reflective banding along the sides of the Sense Pro 5 prioritize visibility while strategically placed webbing tabs accommodate elastic pole-carry straps.
Credit: Jeff Colt
The Patagonia Slope Runner achieved basic at its best, with a simple and effective feature set. While the Salomon Sense Pro 5 is also minimalist, it packs a richer feature set that offers more versatile storage solutions.
The side pole storage on the Black Diamond Distance 15 is one of our favorite features. While stowing requires pack removal, you can easily remove the poles while on the go.
Credit: Matthew Richardson
The UltrAspire Bronco Race has a clever back-entry design, and a stiff strip of material makes grabbing and accessing the vest's contents much easier than the competition. We appreciate how the ADV Skin 12 and Black Diamond Distance 15 provide different locations based on preference.
The thicker foam padding on the UltrAspire Bronco Race makes easy confident access to the rear of the pack. Normally this would require removing the pack potentially costing valuable time.
Credit: Matthew Richardson
Those with less impressive features include the UltrAspire Speedgoat 3.0 Waist, Osprey Duro LT, REI Co-op Swiftland 5, and the Nathan Quickstart 2.0 6L. Depending on your goals, the lack of features may not be an issue, as it also tends to create a lightweight minimalist pack. However, if you need more features, these pack could be frustrating over the long haul.
The Pinnacle 12 offers an additional side access point for the main rear pockets, putting all of that gear in reach while running and making it easy to empty or resupply at aid stations.
Credit: Jeff Colt
Hydration System
Hydration packs are designed to carry water and address the bounce, jostle, and bound of a runner's stride. Most of the vests include one or more hydration systems: soft flasks, hydration bladders, or hard bottles. We think that companies should include a fluid-holding container when selling a hydration pack, and those that didn't lost favor in our scoring.
Most of these packs use chest-mounted bottles/flasks or a back-mounted bladder and hose setup. Each has pros and cons. We tested the effectiveness of the hydration system included with the purchase; if one wasn't included, we used what we thought worked best.
A hydration pack, whether in vest or belt form, using soft flasks, hard bottles, or a reservoir, should make it easy to reach, drink, and refill. Some products do an okay job at one or all of these tasks, while others stand out as a cut above.
Credit: Nathaniel Bailey
Bladder & Hose
Bladders, or reservoirs, typically hold between 1.5 and 2 liters of water and are secured in a sleeve pocket on the back of the pack. A hose stretches from the bottom of the bladder over your shoulder and has a nozzle from which to drink. Bladders have advantages, including a large carrying capacity and the ease of drinking while staying focused on the trail.
The magnetic closure on the Nathan Vapor 3.0 is secure and easy to adjust, making it our favorite hose attachment system.
Credit: Matthew Richardson
The disadvantages include: typically only used with water, as the hose is hard to clean; annoying and time-consuming to fill; some tubes flap around while running. Other issues include, water in the hose is susceptible to heating up from the sun or freezing in the cold; and sloshing.
A single zipper opens up access to the hydration bladder and the primary storage along the back of the REI Swiftland.
Credit: Jeff Colt
The Nathan Pinnacle has one of our favorite hydration bladder systems. It's lightweight, fillable with one hand, and never leaked. The clever hourglass shape worked well with the longer vest and prevented most of the sloshing. The routing provides comfortable hose management, and a magnetic clip keeps the hose from flapping.
The Pinnacle's 1.6L reservoir is hourglass-shaped, which helps it from shifting around in the vest.
Credit: Jeff Colt
Most of the products we reviewed will accommodate a bladder, even if they don't include one. If you purchase a bladder separately, make sure it is designed to be compatible with your pack.
Chest-Mounted Bottles/Flasks
Mounting the hydration system on the chest includes storing liquids in two bottles inside pockets, or “hydration sleeves.” This placement allows you to bring water and an electrolyte mix. It also helps you keep tabs on your liquid supply. For racing, quickly removing and filling the bottles while wearing the pack is a significant advantage.
The soft flasks on the Salomon are among the easiest for entry and exit, and the bottle straps keep your water securely in place.
Credit: Matthew Richardson
Chest-mounted bottles put sloshing liquid upfront, and an improper fit can be bothersome. Moreover, the rigid plastic bottles may cause ribcage irritation. Soft flasks are harder to stuff into their pockets, and they contract as they empty, which can change the fit of your vest and cause irritation.
The Ultra Vest 6.0 is the top dog here, with its two 500-milliliter flasks that fit into sleeves on the shoulders, with an elastic strap to secure them in place. The ADV Skin 12 Set uses slim chest-mounted hydration flasks that slide in and out better than other systems. Loops are provided to keep the cap snug against your chest, reducing movement.
Add Some Flasks
We recommend buying two soft flasks for additional water, no matter which vest or system you invest in. Even if you use them only as back-ups, you'll never be sorry you have them.
The flask location does make access difficult when running quickly.
Credit: Nathaniel Bailey
Hydration Belts
Belts hold flasks around your hips; depending on the belt, these can be hard or soft flasks. Our least favorite hydration system is found in the Raide Research LF 2L. The Raide uses a single soft flask held in a pouch. This makes access difficult when moving quickly, but provides a secure ride. The UltrAspire Speedgoat 3.0 wasn't much easier and also performed poorly in our tests for hydration. This belt has two hard flasks in the back. They are easy to access, but aren't comfortable when the belt is fitted correctly to prevent bouncing. The tops of the hard flasks cut into the small of our back, particularly on the downhills.
The hard flasks can create a little discomfort at higher speeds when the belt is tight enough to prevent bouncing.
Credit: Nathaniel Bailey
Volume-to-Weight Ratio
We assessed various packs, from minimalist race vests to larger fastpacking bags. To compare 1.5L vests to 15L packs, we used a volume-to-weight ratio equation. The best packs have a higher value of over 1.0, while smaller and heavier packs will have a value below 1.0.
We weighed each pack without flasks, bottles, bladders, or external removable accessories. Then, we divided the measured weight by the vest's stated storage volume. This equation is designed to place smaller, race-oriented packs on a level playing field with larger packs sporting more storage. Besides carrying water, running hydration packs should be able to hold the clothing, food, and equipment you need without disrupting your stride. Higher scores indicate packs that are well-equipped to carry gear while remaining relatively lightweight.
The VaporAir loaded to the gills.
Credit: Jeff Colt
While Salomon's 5-liter carrying capacity is probably accurate for regular use, we fit just as much gear in this pack as those advertising 10 liters of storage.
The Distance 15, is a heavy-hitting, any-condition, multi-day juggernaut, and scores very high.
Needs are More Critical than Overall Capacity
A lower storage capacity doesn't make a pack worse. Consider what you need to bring with you and your running objectives before deciding whether bigger (or smaller) is better.
The Distance 15 is great for covering distance. You can see how much we were able to cram into it. For most shorter runs, this type of pack is overkill.
Pockets
Pockets can be straightforward, or more complex, offering a continuous landscape of pockets. A pack's pocket design impacts comfort, features, volume, and hydration systems.
Running vests have many pockets on the front, attached to the shoulder straps, and sitting on the chest or flanks. Most designs make efforts to make pockets (and their contents) easy to access, even while moving. Ideally, a runner should be able to grab whatever they need without stopping or removing the pack. Many packs now feature a kangaroo pocket, with access points on either side, which uses prime real estate across the lower back to store things like a spare soft flask or extra layer. Another consideration is carrying a phone in an accessible area to easily locate your position on a map or snap a quick photo.
We were able to fit a puffy layer, a rain layer, first aid kit, sat device, a headlamp, an emergency bivy, trekking poles, 1 liter of water, and some nutrition bars and gels into the Salomon ADV Skin 12. Once all packed in, there was still room to fit around 25% more stuff.
Credit: Matthew Richardson
Our favorite pocket configurations were on the Pinnacle 12, Norovan 7, Salomon ADV Skin 12, and Ultra Vest 6.0. These models have tons of different options, all within reach, and all using expandable fabrics to hold different-sized items.
When space and size are limited, the smart shape, size, construction, and placement of pockets are key to ensuring an impressive performance once in us -- even in a hip belt style.
Credit: Nathaniel Bailey
Simply having more pockets doesn't make a pack better. We focused on usefulness and design. The Pinnacle 12, Sense Pro 5, and ADV Skin 12 have a variety of pocket sizes, shapes, and volumes, keeping everything within easy reach, including ample storage, a secure zippered pocket, and a design that places several pockets within reach while moving.
The worst pockets were found on the UltrAspire Speedgoat 3.0 Waist and the Osprey, likely as a result of their belt design that intrinsically limits the number of pockets and what they can hold. However, for shorter quick runs, this couldbe all you need and vast vest storage could be overkill.
A large rear pocket and a highly compressible elastic strap with tightening hooks ensure the Ultra Vest is balanced whether full or empty.
Credit: Jeff Colt
How to Pick the Best Running Hydration Pack
Finding the perfect hydration pack for running requires asking yourself a few questions to narrow your choices.
Adjustability is key to achieving a great fit with any hydration pack.
Credit: Nathaniel Bailey
Does Comfort Matter?
Running with something attached to your body can be awkward, so finding a pack that minimizes discomfort is essential. The first step should always be following the manufacturer's guidelines on sizing and fitting. Snug-fitting packs with adjustment points can further help ensure the best fit. Look for packs that avoid putting pressure on areas like the shoulders or the bladder. Packs that use robust, stretchy material tend to be more comfortable over the long haul than those that opt for straps and stiffer fabrics.
A well-placed zippered pocket is a feature worth having if you need to carry essentials such as food, keys, or a headlamp.
Credit: Jeff Colt
Carrying Capacity
Whether you're just venturing into running or have plans for multi-day runs, finding the right carrying capacity ensures you have enough water and essentials for your trip. Packs with two to six liter capacities are plenty for most runs that are less than a full day. You can fit water, snacks, keys, phone, and a small emergency kit or shell. For full-day runs or longer, look for more storage to take more water and items such as extra layers, a water filter, and more food. Finding the right volume capacity includes considering the variance in your running distances and the type of environment you run in. In our experience, overloading a small vest is often less comfortable than lightly loading a larger one. But ideally, your vest should be perfectly sized for the kinds of runs you undertake the most.
Choosing an appropriate-sized pack helps ensure you'll be prepared for your next trip.
Credit: Matthew Richardson
Bottles or Reservoir?
Deciding between a reservoir bladder system and a bottle system is a personal preference. Water bottles offer the convenience of faster refilling and the ability to use one for water and the other for a hydration mix. A reservoir provides easy access to water while on the go and can typically hold larger volumes. Each system has its cons, such as the added weight on your back with reservoirs or the process of taking water out of your vest while running with bottles. If you're undecided, some hydration packs use bottles and a reservoir system.
Systems for travel in the backcountry have advanced dramatically, allowing a runner to cover huge distances in a day or two. At the center of this lightweight gear overhaul is the hydration pack for running.
Credit: Jeff Colt
What Features?
While running hydration packs are meant to be minimalist by nature, they often include useful features like pockets, trekking pole attachments, and reflective material. Runners who like to carry a small camera with them even in wet conditions will likely want a waterproof pocket, while trekking pole lovers might want to attach them to their pack. When narrowing down pack choices, consider your personal needs and preferred features.
Our lineup includes many different pole-carry strategies. The Black Diamond Distance 15's unique over-the-shoulder design is an interesting and highly functional choice, mimicking the ski-carry style used on ski mountaineering race packs.
Credit: Matthew Richardson
Conclusion
If long-distance running flows through your veins or you love staying hydrated on shorter outings, you're in the right place. Whether you're searching for the perfect day pack or multi-day pack, minimal storage or lots of storage, we think there is a solution in our lineup to meet your goals and budget.
The right pack will have enough room to carry the essentials you need without getting in the way or causing discomfort. The size and features you need will vary based on the length and location of your run and any support services that may be available along the route.
Credit: Jeff Colt
If you are less of a runner, but love wetting your whistle on outdoor adventurs, there are a whole host of great hydration packs with more storage or bigger bladders to accompany you on long hikes and bike rides. If you're looking for more running gear, like running shoes, or building out the perfect running gear kit, we've tested those too.
—Jeff Colt, Matthew Richardson, and Nathaniel Bailey