How to Choose Sleeping Bags for Backpacking
REI Co-op Magma Sleeping Bag - Regular
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This 3-season backpacking sleeping bag uses 700-fill water-resistant down and waterproof / breathable fabric panels to keep you warm and dry in the backcountry.
Shop similar productsKey Details
Fill
700-fill duck down
Weight
2 lbs. 10 oz.
Compressed Volume
8.3
Temperature Rating (F)
10 degrees (F)
- Polymer-coated down fill and waterproof / breathable fabric at the hood, sides and foot protect against damp tent walls
- Water-repellent 700-fill-power duck down offers superior loft and warmth
- Ripstop nylon shell with a durable water-repellent finish sheds light precipitation and protects down fill
- Performance mummy shape keeps weight low and thermal efficiency high
- Vertical baffles in side walls provided more warmth and a better fit than bags that use only horizontal baffles
- Contoured hood, draft collar and full-length draft tube all work to keep warmth in
- Differentiated hood and neck drawcords simplify adjustments; antisnag zipper works smoothly
- Nylon stuff sack and a large cotton storage bag included
- European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags
- Special buy
- 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 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 | 10 degrees (F) - EN |
| Tested Comfort | 22 degrees (F) - EN |
| Temperature Rating (F) | 10 degrees (F) |
| Temperature Rating (C) | -13 degrees (C) |
| Weight | 2 lbs. 10 oz. |
| Shell | Ripstop nylon |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 700-fill duck down |
| Fill Weight | 27 |
| Lining | Mini-ripstop nylon |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 72 inches |
| Shoulder Girth (in.) | 60 inches |
| Hip Girth (in.) | 55 inches |
| Stuff Sack Size | Unavailable inches |
| Stuff Sack Volume | 15 liters |
| Compressed Volume | 8.3 |
| Gender | Unisex |
| Sustainability | 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.
