REI Co-op  Magma 30 Sleeping Bag - Women's

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Insulated with water-resistant premium 850-fill-power goose down, the REI Co-op women's Magma 30 sleeping bag rides light and small in your pack, and delivers our best warmth-to-weight ratio.


  • Designed specifically for women, with increased hip room and decreased shoulder room for improved thermal efficiency
  • Generous knee and foot space and a fitted silhouette help deliver 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
  • REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits
  • Contains materials that meet the bluesign® criteria


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 Bags

Technical Specs

Item #148250
Best Use


Tested Lower Limit

18 degrees (F) - EN

Tested Comfort

29 degrees (F) - EN

Temperature Rating (F)

29 degrees (F)

Temperature Rating (C)

-1.7 degrees (C)




Pertex 15-denier ripstop nylon (bluesign approved)

Zipper Location


Insulation Type


Water-Resistant Down



850-fill-power goose down (bluesign approved)


15-denier ripstop nylon (bluesign approved)

Sleeping Bag Shape


Shoulder Girth (in.)

60 inches

Hip Girth (in.)

57 inches

Stuff Sack Size

6 x 14 inches

Stuff Sack Volume

6.5 liters




Contains materials that meet the bluesign® criteria

From a Climate Neutral Certified brand

64 reviews with an average rating of 4.0 out of 5 stars

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