Sea to Summit Flame Ultralight 48F Sleeping Bag - Women's

Size: Long
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Ultralight and down-filled, the women's Sea to Summit Flame Ultralight 48F sleeping bag is great for fast-and-light summer adventures or hut trips—or as a liner to add warmth to a cool-weather bag.

  • Features

    • 850-fill-power down keeps you cozy
    • 10-denier shell and 7-denier liner materials help deliver a light weight and compact packed size
    • 1/3-length zipper


    Many sleeping bags are rated for temperature by an independent testing protocol. REI and the broader industry now use the International Organization for Standardization (ISO) 23537 protocol, which improves on the older European Norm (EN) 13537 standard; you may still see older items in our assortment that were only EN tested. With either protocol, each bag gets a Comfort (or T-Comfort) rating and Lower Limit (or T-Limit) rating. 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. Ratings are based on a person wearing one long underwear layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38. Many brands use the Comfort rating for women's bags and the Lower Limit rating for men's and unisex bags. Everyone's body and sleep comfort differ, and conditions of use (posture, clothing, sleeping pad R-value, wind, humidity, etc.) affect total insulation, so EN and ISO ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth.
    View all Sea to Summit Women's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Comfort

    48 degrees (F) - EN

    Temperature Rating (F)

    48 degrees (F)

    Temperature Rating (C)

    9 degrees (C)


    Long: 13.9 ounces




    10-denier nylon

    Zipper Location


    Insulation Type


    Water-Resistant Down



    Ultra-dry down

    Fill Weight

    Long: 8 ounces


    7-denier nylon

    Sleeping Bag Shape


    Fits Up To (in.)

    Long: 72 inches

    Shoulder Girth (in.)

    Long: 61 inches

    Hip Girth (in.)

    Long: 58 inches

    Stuff Sack Size

    4.25 x 9 inches

    Stuff Sack Volume

    2.5 liters

    Compressed Volume

    Long: 2.2 liters



  • Reviews
    36 reviews with an average rating of 4.6 out of 5 stars

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