REASONS TO BUY
Comfortable for side sleepers
Plush collar and neck baffle trap heat
REASONS TO AVOID
'Gill' zips are gimmicky
No internal storage pocket
Crinkly hood fabric
NEMO Disco Endless Promise 15 Review
One of the more comfortable sleeping bags on the market for side sleepers
The Nemo Disco Endless Promise 15 is a creative take on a classic formula, better designed to benefit side sleepers.
Credit: Arthur McMahon
By Arthur McMahon ⋅ Review Editor ⋅ October 19, 2026
Our Verdict
The NEMO Disco Endless Promise 15 is a popular choice for side sleepers, and for good reason. It's a roomy, spoon-shaped down bag with a plush hood and thick neck baffle, offering ample space to roll around without losing heat. But it lacks basic features like an internal storage pocket, opting instead for creative but clumsy ventilation 'gills' that didn't work as well as we'd hoped. Drawbacks aside, it's a fairly warm and comfortable bag that packs down, remaining a nice alternative for folks who find traditional mummy bags a bit too restrictive.
Compare to Similar Products
 This Product
NEMO Disco Endless Promise 15 | |||||
|---|---|---|---|---|---|
| Awards |  The Best Value for a Down Sleeping Bag | The Best Value for a Synthetic Sleeping Bag | |||
| Price | $300 List Check Price at REI | $260 List Check Price at REI | $155 List Check Price at Amazon | $129 List Check REI (on sale!) | $25 List Check Price at Amazon |
Overall Score  |
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| Star Rating | |||||
| Bottom Line | One of the more comfortable sleeping bags on the market for side sleepers | This down bag is an excellent value for anyone who prizes warmth, comfort, and affordability above all else | A roomy synthetic bag that's great for car camping, but too large to reasonably carry on a backpacking trip | An affordable, no-frills bag that's perfect for anyone just starting out, though its packed size limits its appeal for long backpacking trips | A low-cost, warm-weather bag that's fine for warm summer nights, but should not be trusted for anything even close to cold weather |
| Rating Categories | NEMO Disco Endless P... | Exped Terra 15 | Sea to Summit Boab S... | REI Co-op Trailmade 25 | Jeaouia Lightweight... |
| Warmth (25%) | |||||
| Weight (25%) | |||||
| Comfort (20%) | |||||
| Packed Size (15%) | |||||
| Features (15%) | |||||
| Specifications | NEMO Disco Endless P... | Exped Terra 15 | Sea to Summit Boab S... | REI Co-op Trailmade 25 | Jeaouia Lightweight... |
| Lower Limit Rating | 16°F (ISO) | 12°F (ISO) | 16°F (ISO) | 20°F (ISO) | 41°F (manufacturer rated) |
| Comfort Rating | 27°F (ISO) | 25°F (ISO) | 25°F (ISO) | 31°F (ISO) | Not Available |
| Insulation | Down with PFAS-free hydrophobic finish, RDS-certified | European Grey Duck Down, RDS certified | Revive Loft 100% RCS-certified, post-consumer, recycled, multi-Denier synthetic | 100% recycled polyester | Hollow cotton |
| Packed Volume | 7.0 L | 9.0 L | 16.0 L | 8.0 L | 11.5 L |
| Measured Weight (Size Regular) | 2.8 lbs | 2.8 lbs | 4.3 lbs | 3.0 lbs | 2.9 lbs |
| Fill Power | 650 FP | 650+ FP | Not listed | Not listed | Not listed |
| Listed Fill Weight | 23.0 oz | Not listed | Not listed | 28.4 oz | Not listed |
| Shell Material | 20D recycled polyester ripstop with non-PFC DWR finish | Recycled 20 D ripstop polyester, PFAS free | 50D 300T recycled polyester pongee w/ non-PFAS DWR | 30D recycled ripstop polyester w/ PFAS free DWR | Ripstop polyester |
| Liner Material | 20D recycled polyester ripstop with non-PFC DWR finish | Recycled 20 D ripstop polyester, DWR free, PFAS free | 50D 300T recycled polyester pongee w/ non-PFAS DWR | 100% polyester w/ PFAS free DWR | Polypongee |
| Hydrophobic Down | Yes | No | N/A | N/A | N/A |
| Neck Baffle | Yes | Yes | Yes | Yes | No |
| Small Organization Pocket | No | Yes | No | Yes | No |
| DWR Treatment | Yes | No | Yes | Yes | No |
| Zipper Info | 3/4-length / left | Full-length / left | Full-length / left | Full-length / left | Full-length / left |
| Listed Shoulder Girth | 62 in | 60 in | 60 in | 62 in | 31.5 in |
| Listed Hip Girth | 57 in | Not listed | Not listed | 54 in | 31.5 in |
| Listed Foot Girth | Not listed | 39 in | 39 in | Not listed | 31.5 in |
| Compression or Stuff Sack Included? | Compression sack | Compression sack | Compression sack | Stuff sack | Compression sack |
| Measured Compression/Stuff Sack Weight | 2.6 oz | 4.9 oz | 3.7 oz | 0.8 oz | 1.1 oz |
Our Analysis and Test Results
The Thermo Gill Vents on the Disco Endless Promise 15 were designed to help with temperature control, but they end up being more frustrating than helpful. Credit: Arthur McMahon
Likes
The Disco Endless Promise 15 is a comfort-forward sleeping bag. The fabric and loft are supple to the touch, and there is extra room to wriggle around inside, which is especially beneficial for side sleepers who find mummy-style bags too confining.
It also packs down well, thanks largely to the well-made compression sack it comes with. The 650 fill-power down may not be as compressible as higher-quality down (like 850 fill-power down). But the adjustable straps on the compression sack let you squeeze it as much as possible, so it takes up relatively little volume in your backpack.
This bag packs down without fuss, and the compression sack condenses it into a small, manageable package. Credit: Arthur McMahon
Another great aspect of the Disco 15 is its temperature-control options. In addition to the main zipper, two 'Thermo Gill' vents dissipate heat from your torso. Second, an oversized neck baffle insulates well, but you can easily fold it down and out of the way if you want more airflow. Between these three options, you can adjust your level of warmth to exactly where you want it.
With a bit of extra space inside the bag, the NEMO Disco 15 is more comfortable to lounge in than a tight mummy bag. Credit: Arthur McMahon
Dislikes
NEMO is always trying to reinvent the wheel when it comes to outdoor gear. Sometimes they knock it out of the park, and sometimes their ideas need a little more R&D before going into production, which is the case here. The innovative Thermo Gill vents are simply frustrating to use.
In total, they require four zippers to operate – two on the outside of the bag and two on the inside. And NEMO decided to use flimsy zipper pulls that constantly snag on the fabric. So to open these 'gills', you have to reach your arms outside the bag and pull them inch by inch as they snag, then do the same on the inside zippers. It's too much work for what a simple pull on the main zipper already accomplishes.
The thin, not anti-snag zips of the Thermo Gill vents are frustrating to use. Credit: Arthur McMahon
Another odd choice was using a different material for the footbox and hood. Yes, it's nice that these shell pieces are waterproof and recyclable, but they are also crinkly and loud. For the footbox? Sure, why not. But on the hood so close to your ears? This just seems like a big oversight.
Sound on — you can hear how crinkly and crunchy this piece of hood shell fabric sounds. Credit: Arthur McMahon
Should You Buy the NEMO Disco Endless Promise 15?
The saving grace of the NEMO Disco Endless Promise 15 is that you don't have to use the gills if you don't want to, and that crinkly hood panel is on the back of your head. So if you're buying this bag as a side sleeper, the downsides are basically null and void. Anyone who wants a bit of extra room to move around should consider this sleeping bag – gimmicks aside, it's worth it.
What Other Backpacking Sleeping Bags Should You Consider?
The Mountain Hardwear Bishop Pass 15 is a warmer, lighter, and more packable sleeping bag at a similar price point. And its design is a bit more traditional, including a helpful storage pocket. If you're considering the NEMO Disco 15 for its comfort, you should check out the Marmot Wraptor Down 15. It's warmer and roomier than the Disco, plus it has no zippers, an inventive take that works surprisingly well.
—Arthur McMahon
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