Co-op Magma 10 Sleeping Bag - Men's

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  • Regular price $369.00


  • 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 goose down and supple 15-denier lining combine to provide lasting coziness and a super-soft feel
  • Trapezoidal foot box keeps feet comfy; a toe box baffle positions downward to provide warmth
  • Variable baffle spacing locates and stabilizes down fill, delivering high thermal efficiency and reducing weight
  • New zipper cover and internal antisnag strip combine for easy zipping; a hybrid zipper path provides easy access along shoulders and torso
  • A contoured hood retains warmth while providing space for a low-profile pillow; two 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
  • 2017 Editors' Choice Award winner from Backpacker Magazine


Many sleeping bags are rated for temperature by an independent testing protocol, the European Norm (EN) 13537. Each bag gets two ratings: a Comfort rating and Lower limit rating. The Comfort rating is the lowest temperature at which the bag will keep the average woman (or "cold sleeper") comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep an average man (or “warm sleeper”) comfortable. Everyone's body and sleep comfort is different, so EN Ratings are merely a guideline to help you compare products.

Technical specs

Best Use
EN Lower Limit
10 degrees Fahrenheit
EN Comfort
22 degrees Fahrenheit
Temperature Rating (F)
Temperature Rating (C)
Long: 2 lbs.
Regular: 1 lb. 14 oz.
15-denier ripstop nylon (bluesign® approved)
Zipper Location
Insulation Type
Water-Resistant Down
850-fill goose down
Fill Weight
Long: 540 grams
Regular: 500 grams
15-denier ripstop nylon
Sleeping Bag Shape
Fits Up To (in.)
Long: 78 inches
Regular: 72 inches
Shoulder Girth (in.)
60 inches
Hip Girth (in.)
57 inches
Stuff Sack Size
7.5 x 15 inches
Compressed Volume
Long: 7.9 liters
Regular: 7.3 liters
Down certified to the Responsible Down Standard (RDS), Contains materials that meet the bluesign® criteria