REASONS TO BUY
Very warm
Lightweight
High-quality hydrophobic down
Multiple size options
REASONS TO AVOID
Size can feel restrictive
Relatively expensive
REI Co-op Magma 15 Review
Super warm for the weight, this high-quality bag is less roomy than we'd like, though it is offered in plenty of size options
The REI Co-op Magma 15 is a well-rounded sleeping bag that will work well for just about anyone.
Credit: Arthur McMahon
By Arthur McMahon ⋅ Review Editor ⋅ October 19, 2026
Our Verdict
The REI Co-op Magma 15 is a fantastic sleeping bag: it's warm, comfortable, and pretty darn packable. But it's also pretty darn expensive, and it doesn't quite shine bright enough to stand out among the competition. While a few better bags are available for less money, most other options aren't as well-rounded as the Magma 15. It has recently been redesigned as gender-neutral, offering multiple size options – from short and narrow to long and wide – making it one of, if not the most inclusively sized sleeping bags on the market.
Compare to Similar Products
 This Product
REI Co-op Magma 15 | |||||
|---|---|---|---|---|---|
| Awards |  The Best Value for a Down Sleeping Bag |  The Most Comfortable Sleeping Bag | The Best Value for a Synthetic Sleeping Bag | ||
| Price | $399 List Check REI (on sale!) | $260 List Check Price at REI | $309 List Check REI (on sale!) | $129 List Check REI (on sale!) | $25 List Check Price at Amazon |
Overall Score  |
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| Star Rating | |||||
| Bottom Line | Super warm for the weight, this high-quality bag is less roomy than we'd like, though it is offered in plenty of size options | This down bag is an excellent value for anyone who prizes warmth, comfort, and affordability above all else | With overlapping down-filled flaps instead of a zipper, this unique bag is exceptionally warm and comfortable | 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 | REI Co-op Magma 15 | Exped Terra 15 | Marmot Wraptor Down 15 | REI Co-op Trailmade 25 | Jeaouia Lightweight... |
| Warmth (25%) | |||||
| Weight (25%) | |||||
| Comfort (20%) | |||||
| Packed Size (15%) | |||||
| Features (15%) | |||||
| Specifications | REI Co-op Magma 15 | Exped Terra 15 | Marmot Wraptor Down 15 | REI Co-op Trailmade 25 | Jeaouia Lightweight... |
| Lower Limit Rating | 9°F (ISO) | 12°F (ISO) | 11°F (ISO) | 20°F (ISO) | 41°F (manufacturer rated) |
| Comfort Rating | 21°F (ISO) | 25°F (ISO) | 22°F (ISO) | 31°F (ISO) | Not Available |
| Insulation | Goose down, water-resistant and bluesign approved | European Grey Duck Down, RDS certified | Duck Down | 100% recycled polyester | Hollow cotton |
| Packed Volume | 6.2 L | 9.0 L | 8.0 L | 8.0 L | 11.5 L |
| Measured Weight (Size Regular) | 2.3 lbs | 2.8 lbs | 2.9 lbs | 3.0 lbs | 2.9 lbs |
| Fill Power | 850 FP | 650+ FP | 650 FP | Not listed | Not listed |
| Listed Fill Weight | 23.3 oz | Not listed | Not listed | 28.4 oz | Not listed |
| Shell Material | Recycled nylon | Recycled 20 D ripstop polyester, PFAS free | 100% postconsumer recycled polyester ripstop | 30D recycled ripstop polyester w/ PFAS free DWR | Ripstop polyester |
| Liner Material | 15D recycled nylon | Recycled 20 D ripstop polyester, DWR free, PFAS free | 100% postconsumer recycled polyester plain weave | 100% polyester w/ PFAS free DWR | Polypongee |
| Hydrophobic Down | Yes | No | Yes | N/A | N/A |
| Neck Baffle | Yes | Yes | Yes | Yes | No |
| Small Organization Pocket | Yes | Yes | Yes | Yes | No |
| DWR Treatment | Yes | No | No | Yes | No |
| Zipper Info | Full-length / left side | Full-length / left | N/A (no zipper) | Full-length / left | Full-length / left |
| Listed Shoulder Girth | 62.5 in | 60 in | 60 in | 62 in | 31.5 in |
| Listed Hip Girth | 54 in | Not listed | 64.6 in | 54 in | 31.5 in |
| Listed Foot Girth | Not listed | 39 in | 53.5 in | Not listed | 31.5 in |
| Compression or Stuff Sack Included? | Stuff sack | Compression sack | Storage sack | Stuff sack | Compression sack |
| Measured Compression/Stuff Sack Weight | 1.0 oz | 4.9 oz | 4.1 oz | 0.8 oz | 1.1 oz |
Our Analysis and Test Results
The REI Co-op Magma 15 is a cozy sleeping bag for spring or fall backpacking trips, when temperatures start to drop and bad weather may be in the forecast. Credit: Arthur McMahon
Likes
The REI Co-op Magma 15 doesn't disappoint in any sense. It's plenty warm, with an ISO-rated lower limit of 9°F, and it's filled to the brim with 850-fill-power, water-resistant down insulation. It also features a DWR finish on the shell, which further helps this bag stay dry in wet climates.
The Magma 15 is wholly designed to be inclusive, with nine sizing options, including short, narrow, long, and wide. While the mummy shape is meant to hug your body to improve insulation, the range of sizes lets you find the perfect fit for your body shape.
So fluffy and adjustable, you can enclose your entire body. Credit: Arthur McMahon
Beyond the basics, it includes a trove of nice-to-have features. A contoured hood with two drawcords makes it easy to cinch and snuggle down on chilly nights. A fluffy insulated yoke traps warm air, and a sewn-in anti-snag zipper strap makes it easier to get in and out. We always appreciate sleeping bags with internal storage pockets, which help preserve the battery life of critical electronics.
A safe internal storage pocket for your phone or other electronics is a practical feature. Credit: Arthur McMahon
Dislikes
The REI Co-op Magma 15 is a jack-of-all-trades but master of none. There's not much to dislike about this bag — it just doesn't outperform its premium-priced competition, and there are more affordable bags we like a bit more.
The Magma 15 comes with a simple drawstring stuff sack. Given the price point, it would be nice if it included a compression sack. Credit: Arthur McMahon
Compared to those premium sleeping bags, the Magma 15 is just a little heavier, though just as warm. While it has some nice features, it doesn't match the overall quality of more expensive bags. It's a shame the Magma 15 is this expensive; otherwise, it would surely be an award-winner for overall value.
And though multiple sizing options are available, the mummy-style shape will take some getting used to, especially if you're coming from a big, rectangular sleeping bag. Mummy bags maximize warmth, that's why they're so popular, but they can also feel restrictive. We tested the regular size of the Magma 15, and measuring 54 inches in the hips, it's even on the tighter side for a mummy bag.
Although it's cozy, we wish there were a bit more room to move around in the Magma 15. Credit: Arthur McMahon
Should You Buy the REI Co-op Magma 15?
The REI Co-op Magma 15 is a fantastic backpacking bag and could be an excellent upgrade from a budget-friendly sleeping bag. It offers the warmth, comfort, and packability most backpackers need. Really, the only catch is that there are warmer, more comfortable bags that don't cost quite as much.
What Other Backpacking Sleeping Bags Should You Consider?
If the Magma 15 is a bit outside your budget, the Exped Terra 15 is a very similar, though less expensive option. In many ways, it's directly comparable to the Magma 15, just a bit heavier. Or, if you're already set on investing in a premium sleeping bag and want to go all out and get the best bag possible, nothing beats the Western Mountaineering MegaLite. It's warmer, lighter, and more packable than the Magma 15, and as a hand-sewn sleeping bag, its quality is unmatched.
—Arthur McMahon
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