REASONS TO BUY
Versatile
Affordable
Customizable
Comfortable
Lightweight
User-friendly design
REASONS TO AVOID
Lower maximum load
Less plush padding
REI Co-op Flash 55 - Women's Review
Both affordable and customizable, this pack comes equipped to tackle a variety of adventures, all in a very weight-conscious and beginner-friendly way
Warm days with moderate loads are super comfortable with the minimalistic and modular Flash.
Credit: Ally Arcuri
Our Verdict
For beginning backpackers, ultralight enthusiasts, or anyone who wants a big backpack for all kinds of adventures on a budget, we wholeheartedly recommend the updated REI Flash. Weighing in at 2.7 pounds with all of its movable pockets and pouches, this lightweight pack can haul moderate loads for multiday trips. The added torso adjustment feature allows for easy size adjustments, even when the pack is fully loaded. The density of the padding on the hip belt can feel a bit stiff, but for a lightweight pack, the spring steel frame provides plenty of support. If you are looking for a lightweight and user-friendly pack that allows you to take on multiday trips, birding outings, and beyond on a budget, the Flash 55 is a great backpacking backpack to consider. To see how it stacks up to other packs in our test, check out our review of the top women's backpacking packs.
Editor's Note: This review was updated on April 30, 2024, to include new information and comparisons to the rest of our lineup.
Compare to Similar Products
 This Product
REI Co-op Flash 55 - Women's | |||||
|---|---|---|---|---|---|
| Awards |  Most Versatile Women's Backpacking Pack |  Best Overall Backpacking Backpack for Women |  Best Bang for Your Buck | Best Organizational Systems | |
| Price | $199 List $138.93 at REI | $259.15 at Amazon Compare at 3 sellers | $190.00 at REI Compare at 4 sellers | $165.72 at Dick's Sporting Goods | $189.00 at Amazon Compare at 3 sellers |
Overall Score  |
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| Star Rating | |||||
| Bottom Line | From ultralight overnights to meandering multiday excursions, this lightweight and affordable pack can be adjusted to adapt to different types of demands - all in an extremely straightforward way | This women's pack is comfortable and well-designed, including near-effortless adjustment options, a trampoline mesh back panel, and a removable brain | A comfortable, roomy, durable pack that is friendly on your wallet and your body while you hike | Full of neat features, cavernous pockets, and a well-padded back panel segmented by an airy, mesh chimney making it great for warm hikes in the backcountry | A well-cushioned, but somewhat heavy pack that is chock full of useful pockets - all of which are intelligently placed for optimal organization |
| Rating Categories | REI Co-op Flash 55... | Osprey Eja 58 | Osprey Renn 65 | Big Agnes Garnet 60... | Deuter Aircontact C... |
| Comfort (40%) | |||||
| Ease of Use (25%) | |||||
| Weight-to-Volume Ratio (20%) | |||||
| Adjustability (15%) | |||||
| Specs | REI Co-op Flash 55... | Osprey Eja 58 | Osprey Renn 65 | Big Agnes Garnet 60... | Deuter Aircontact C... |
| Advertised Volume | 55 L | 55 - 58 L | 65 L | 60 L | 60 + 10 L |
| Measured Weight | 2.7 lb | 2.7 lb | 3.6 lb | 3.8 lb | 4.9 lb |
| Overall Weight-to-Volume Ratio | 0.79 oz/L | 0.79 oz/L | 0.89 oz/L | 1.01 oz/L | 1.12 oz/L |
| Volumes Available | 55 L | 38, 48, 58 L | 50, 65 L | 60+7 L | 45+10, 60+10 L |
| Sizes Available | XS, S, M, adjustable torso | XS/S, M/L, adjustable torso | One size, extended fit one size; adjustable torso | One size, adjustable torso | One size, adjustable torso |
| Organization Compartments | Lid, double side pockets, front pocket, hip belt pockets, shoulder strap phone pocket, main compartment | Lid, mesh side pockets, front stretch pocket, dual zippered pockets on hip belt, main compartment | Lid, side pockets, hip belt pockets, main compartment | Lid, hydration bladder pocket, 2 stretch mesh side pockets, a front quick-stash pocket and a front zip pocket with key keeper | Lid, mesh side pockets, front stretch pocket, zippered top pocket, inner stretch compartment, bottom compartment with zippered divider, internal valuables pocket, dual zippered pockets on hipbelt |
| Measured Volume (main compartment) | 45 L | 45 L | 40 L | 50 L | 50 L |
| Access | Top | Top | Top, bottom | Top | Top, panel |
| Women's Specific Features | Women's specific fit | Women's specific fit | Women's specific fit | Women's specific fit | Women's specific fit |
| Hydration Compatible | Yes | Yes | Yes | Yes | Yes |
| Rain Cover Included | No | No | Yes | No | No |
| Sleeping Bag Compartment | No | No | Yes | No | Yes |
| Bear Can Compatible | Yes - Vertical | Yes - verical and horizontal | Yes - Vertical and Horizontal | Yes - Vertical and Horizontal | Yes - Vertical and Horizontal |
| Main Materials | 100D robic ripstop nylon; bluesign approved | 100D high-tenacity recycled ripstop nylon | 600D polyester | Recycled high-tenacity Mipan regen robic nylon | 235D recycled polyamide |
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Our Analysis and Test Results
The REI Flash 55 is an incredibly worthy contender in the fight to see which backpacking backpack for women is the best on the market. At only 2.7 pounds with removable pockets, you can get this pack down to a scant 2 pounds if you are motivated to shed weight. Made of thin, ripstop nylon and featuring a roll-top closure, this is one of our top recommendations for newbie backpackers who want a well-featured trail companion without over-purchasing.
Performance Comparison
This lightweight pack provides enough space and comfort for short trips or multiday outings.
Credit: Ally Arcuri
Comfort
REI has incorporated a strong, stable suspension system for a lightweight pack. When fully loaded with up to 33 pounds, the weight is well distributed to your hips and doesn't sag onto your shoulders. We found that the frame didn't provide as much support once we added more than the recommended amount of weight, preventing the Flash from succeeding as a “super hauler.”
The Flash has a smaller-feeling frame than some of the other packs we tested, making it suitable for smaller-bodied people. Compared to some of the more ruggedly built packs in our lineup, the Flash feels unimposing and comfortable, even on our 5'2" tester. REI makes four different sizes of the Flash, all of which come with an easy torso adjustment system on the back panel. This ensures that a wider variety of body shapes and sizes can find the right fit. The hip belt padding is fixed and constructed of densely woven textile, making it feel stiffer than some. The padding on the back panel is also dense but provides comfortable and unintrusive support. The perforated mesh adorning the back panel helps air flow through, further adding to this pack's overall comfort.
The textured mesh backing strikes a nice balance between plush and rigid and the shapely panels allow for breathability.
Credit: Ally Arcuri
Ease of Use
When it comes to backpacking backpacks, our testers find that keeping things simple is usually the way to go. Our lead testers prefer backpacks with fewer organizational features, which is part of why the Flash is one of our highest scorers in this metric. Whether you are just packing up or deep in the backcountry looking for your extra fleece to stay warm, this pack is user-friendly.
The Flash features a Packmod design. This design lets you easily move or remove additional pockets for a customizable backpacking experience. The lid, hip pockets, and mesh cellphone pocket can all be easily moved to your liking, ultimately lessening the weight of this already lightweight pack. The drybag style roll-top closure is easy to use as an access point and a compressive feature. The wide mouth of the Flash makes it super easy to sift through your gear in a loaded back. While lacking additional access points, having the ability to open the top so wide makes accessing your gear a lot easier.
The roll-top closure is super easy to use and provides a bit of weather-resistance in case the clouds roll in.
Credit: Ally Arcuri
The Flash has bilateral side pockets in addition to its mesh water bottle pockets. These ripstop nylon pockets and beavertail exterior pouch keep quick-draw items within reach without so much as a zipper in the way. Beyond just the ripstop pouches, each side of the Flash has a mesh pocket that is slanted forward specifically for easy access to your water bottle.
The ample space in the side pockets of the Flash makes grabbing water bottles and extra layers easy as you hike.
Credit: Ally Arcuri
Weight-to-Volume Ratio
At 2.7 pounds, this model is lighter than most but still has a strong enough frame to carry moderate loads up to around 30 pounds. In fact, the Flash outperformed many packs that weigh more with burly suspension systems. While none of the packs we tested made our heaviest loads feel lighter, some of them certainly felt more comfortable than others, the Flash included.
Even with a slightly smaller capacity than the other packs we tested, the volume-to-weight ratio of the Flash is impressive. More than just throwing up impressive numbers, though, the Flash remains comfy for the long haul when fully loaded. To keep the weight of the Flash comfortable, it is important to use the compression systems that are built into the pack. Since the Flash has a more minimalistic design and the bulk of the gear gets stowed in the main pocket, our heaviest loads were a bit lumpy and off-kilter. Once we used the external compression straps and really tamped the roll-top upper down, we felt significantly more balanced.
Both hip belt pockets are removable. In total, the removable elements of the Flash allow you to drop 7 ounces of weight.
Credit: Ally Arcuri
Adjustability
The Flash is a standout choice in this metric. Not only is the sliding torso adjustment easy to use, but the greater availability of sizes offered by REI makes it easy to ensure a proper fit from the get-go.
Like many lightweight packs, the hip belt padding is fixed. The padding comes fairly far around the pelvic bones of average-sized women, but larger-hipped women will find that it stops short of where they may like for comfort. The thick webbing offers plenty of extra length, but without extra padding, it can be less comfortable as the miles add up.
The easy sliding torso adjustments allow you to fine-tune your pack's fit for optimal comfort.
Credit: Ally Arcuri
Should You Buy the REI Flash 55?
If you are a beginning backpacker who wants a pack that will comfortably get the job done without being too much pack, the Flash is a great backpacking pack to consider. Its approachable frame size, modular organizational system, and easy-to-use features make it a great choice and a great value. Lightweight adventure enthusiasts, rejoice! The lightweight Flash could also be a fantastic choice for your next adventure.
A few basic updates took the Flash from being a mediocre pack to one that we recommend for beginners and ultralight-focused folks alike.
Credit: Ally Arcuri
What Other Backpacking Backpacks Should You Consider?
If you are looking for a great pack on a budget but aren't sure if the Flash is right for you, we recommend checking out one of our absolute favorites, the Osprey Eja 58. The Eja is similar to the Flash in that it is lightweight, but the Eja more keenly places comfort at its center. For a bit more money, the Eja is a wear-all-pack due to its comfortable back panel and lightweight fit. Another favorite is the Osprey Renn 65, a comfortable and rugged pack that is well-suited for smaller bodies and costs about the same. The frame of the Flash makes it comfortable on smaller statures, but the Renn takes a different approach. The design of the Renn spreads the weight of the load out laterally instead of creating a vertical tower of gear on your back.
—
Ally Arcuri and Elizabeth Paashaus
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