REI Co-op Magma 15 Sleeping Bag

The updated REI Co-op Magma 15 sleeping bag ensures comfort and toasty warmth without adding extra weight. An extended range of sizes delivers your best fit for better sleep.

Inclusive sizing lets you find your best fit based on body shape and sleeping preferences. The light-but-not-tight performance fit contours to your body shape, fitted throughout to reduce weight and increase thermal efficiency, while a recycled downproof shell, water-resistant 850-fill-power goose down and supple recycled lining combine to provide cozy warmth and a supersoft feel.

Key Features

Best Use	Backpacking
Tested Lower Limit	9 degrees (F) - ISO
Tested Comfort	21 degrees (F) - ISO
Temperature Rating (F)	15 degrees (F)
Temperature Rating (C)	-9 degrees (C)
Weight	Short: 2 lbs. 1.9 oz. Short Wide: 2 lbs. 4.4 oz.
Shell	Recycled ripstop nylon (bluepass certified)
Zipper Location	Left
Insulation Type	Down
Water-Resistant Down	Yes
Fill	850-fill-power water-resistant goose down (bluepass certified)
Fill Weight	Short: 1 lb. 4.9 oz. Short Wide: 1 lb. 6.7 oz.
Sleeping Capacity	1-person
Lining	Recycled 15-denier ripstop nylon (bluepass certified)
Sleeping Bag Shape	Mummy
Fits Up To (in.)	Short: 65 inches Short Wide: 65 inches
Shoulder Girth (in.)	Short: 61.5 inches Short Wide: 69 inches
Hip Girth (in.)	Short: 53 inches Short Wide: 61.5 inches
Stuff Sack Size	Short: 7.8 x 16.5 inches Short Wide: 7.8 x 16.5 inches
Stuff Sack Volume	Short: 10 liters Short Wide: 10 liters
Compressed Volume	Short: 6.5 liters Short Wide: 7.7 liters
Gender	Unisex
Sustainability	Contains recycled materials Contains bluepass certified material From a Climate Label Certified brand

Highlights

• Inclusive sizing lets you find your best fit based on body shape and sleeping preferences
• Light-but-not-tight performance fit contours to your body shape; it's fitted throughout to reduce weight and increase thermal efficiency
• Recycled downproof shell, water-resistant 850-fill-power goose down and supple recycled lining combine to provide cozy warmth and a supersoft feel
• Durable water repellent (DWR) finish made without PFAS on the shell helps moisture bead up on the surface
• Hood's contoured shape fits securely around your head and cinches up for maximum warmth; 2 differentiated drawcords make it easy to adjust while you're zipped in the bag
• Variable baffle spacing locates and stabilizes the down fill, delivering thermal efficiency and reducing weight
• Zipper path wraps around the front of your chest so you can more easily zip and unzip the bag; zipper cover and internal antisnag strip means frustration-free zipping
• Trapezoidal footbox has room to move your feet while reducing excess space to increase warmth and decrease weight
• Insulated yoke fills the neck and shoulder gap to prevent heat loss
• Interior stash pocket lets you keep personal items close and easy to access
• Includes a stuff sack for packing and a roomy mesh sack for breathable storage
• Hand-wash or machine wash warm, gentle cycle in front-load washer only; do not bleach; rinse thoroughly; do not wring; air dry or tumble dry low; do not iron or dry clean
• Contains bluepass certified material
• 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

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Materials & care

Hand-wash or machine wash warm, gentle cycle in front-load washer only; do not bleach; rinse thoroughly; do not wring; air dry or tumble dry low; do not iron or dry clean

Size chart

Warranty

REI return policy

Do I really need a backpacking-specific bag?

Yes. Compared to camping-specific versions, these bags are lighter, pack down smaller and are more efficient at keeping you warm.

Sleeping bag weight

Insulation type and bag shape affect weight the most. Always consider bags of a similar temperature rating when comparing weight.

Sleeping bag fit

Sleeping bags come in regular, long, wide and short sizes (or a mix of the two, like long-wide). Review the bag's size specs for the best fit.

Sleeping bag features

Draft-blocking details, a snug-fitting hood, extra zippers and even a stash pocket can add durability, warmth and function.

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.

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.

Contains recycled materials. Contains bluepass certified material. From a Climate Label Certified brand.