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

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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.


  • 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


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. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Sea to Summit Backpacking Sleeping Bags

Technical Specs

Item #191477
Best Use


Tested Comfort

48 degrees (F) - EN

Temperature Rating (F)

48 degrees (F)

Temperature Rating (C)

9 degrees (C)




10-denier nylon

Zipper Location


Insulation Type


Water-Resistant Down



Ultra-dry down


7-denier nylon

Sleeping Bag Shape


Stuff Sack Size

4.25 x 9 inches

Stuff Sack Volume

2.5 liters



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