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If you want to hike ultralight and sleep well at night, look no further—850-fill-power goose down gives the women's REI Co-op Magma 15 sleeping bag our highest warmth-to-weight ratio.

  • Features

    • 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 certified to the Responsible Down Standard (RDS) and 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
    • New 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


    Many sleeping bags are rated for temperature by an independent testing protocol. With both European Norm (EN) 13537 and International Organization for Standardization (ISO) 23537 testing, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. The Comfort/T-Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit/T-Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Ratings are based on a person wearing one long underwear layer and a hat, sleeping on a single 1 in. thick insulating pad. Many brands use the Comfort rating for women's bags and the Lower rating for men's and unisex bags. Everyone's body and sleep comfort differ, so EN and ISO ratings are simply a guideline to help you compare products.
    View all REI Co-op Women's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    3 degrees (F) - EN

    Tested Comfort

    17 degrees (F) - EN

    Temperature Rating (F)

    17 degrees (F)

    Temperature Rating (C)

    -8.3 degrees (C)


    Long - Right Zip: 2 lbs. 6 oz.

    Regular - Right Zip: 2 lbs. 4 oz.


    Pertex® 15-denier ripstop nylon (bluesign® approved)

    Zipper Location


    Insulation Type


    Water-Resistant Down



    850-fill-power goose down (RDS certified and bluesign® approved)

    Fill Weight

    Long - Right Zip: 1 lb. 8.5 oz.

    Regular - Right Zip: 1 lb. 7.5 oz.


    15-denier ripstop nylon (bluesign® approved)

    Sleeping Bag Shape


    Fits Up To (in.)

    Long - Right Zip: 72 inches

    Regular - Right Zip: 66 inches

    Shoulder Girth (in.)

    60 inches

    Hip Girth (in.)

    57 inches

    Stuff Sack Size

    7.5 x 15 inches

    Stuff Sack Volume

    10.9 liters

    Compressed Volume

    Long - Right Zip: 10 liters

    Regular - Right Zip: 7.3 liters




    Down certified to the Responsible Down Standard (RDS)

    Contains materials that meet the bluesign® criteria

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