How to Choose Sleeping Bags for Backpacking
REI Co-op Magma 15 Sleeping Bag - Men's
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Superlight, very compressible and insulated with water-resistant, premium 850-fill-power goose down, the REI Co-op men's Magma 15 sleeping bag delivers our best warmth-to-weight ratio.
Shop newer versionKey Details
Fill
850-fill-power goose down (bluesign approved)
Temperature Rating (F)
16 degrees (F)
- Designed with generous knee and foot space and a fitted silhouette that delivers the most efficient warmth-to-weight ratio in the REI Co-op brand sleeping bag line
- Downproof Pertex® shell, water-resistant 850-fill-power goose down and supple 15-denier lining combine to provide lasting coziness and a supersoft feel
- Down is bluesign® approved
- Trapezoidal footbox keeps feet comfy; a toe box baffle positions downward to provide warmth
- Variable baffle spacing locates and stabilizes the down fill, delivering high thermal efficiency and reducing weight
- Zipper cover and internal antisnag strip combine for easy zipping; a hybrid zipper path provides easy access along shoulders and torso
- Contoured hood retains warmth while providing space for a low-profile pillow; 2 different hood drawcords allow internal adjustment to avoid heat loss
- Insulated yoke fills neck and shoulder gap to prevent heat loss
- Includes a stuff sack for packing and a roomy mesh sack for breathable storage
- Contains materials that meet the bluesign® criteria
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Our backpacking bags are rated for temperature according to an independent testing protocol: International Organization for Standardization (ISO) 23537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. For REI Co-op brand nongendered sleeping bags, we provide an overall temperature rating that falls between the Comfort and Lower Limit ratings.
View the REI Co-op Magma Product LineView all REI Co-op Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. For REI Co-op brand nongendered sleeping bags, we provide an overall temperature rating that falls between the Comfort and Lower Limit ratings.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 16 degrees (F) - ISO |
| Tested Comfort | 28 degrees (F) - ISO |
| Temperature Rating (F) | 16 degrees (F) |
| Temperature Rating (C) | -8.9 degrees (C) |
| Ultralight | Yes |
| Shell | Pertex 15-denier ripstop nylon (bluesign approved) |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850-fill-power goose down (bluesign approved) |
| Lining | 15-denier ripstop nylon (bluesign approved) |
| Sleeping Bag Shape | Mummy |
| Shoulder Girth (in.) | 63 inches |
| Hip Girth (in.) | 57 inches |
| Stuff Sack Size | 7.5 x 15 inches |
| Stuff Sack Volume | 10.9 liters |
| Gender | Men's |
| Sustainability | Contains materials that meet the bluesign® criteria From a Climate Label Certified brand |
Buying Advice
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
