Kelty Cosmic Down 0 Sleeping Bag

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Camp in cozy comfort and in all conditions with the 3-season Kelty Cosmic Down 0 sleeping bag. It helps keep you toasty and comfy with quick-drying down insulation and soft-as-silk nylon taffeta.


  • 600-fill-power DriDown™ water-resistant down and the durable water repellent (DWR) treatment are PFC-free
  • 20-denier nylon taffeta shell is soft yet durable
  • 50-denier polyester taffeta lining feels like satin sheets on your skin
  • 2-way locking 60 in. zipper features an antisnag design
  • Draft collar and comfortable hood help keep the cold out and the heat in
  • Handy stash pocket keeps your headlamp or other small essentials close at hand
  • Stuff sack included
  • Closeout


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 the Kelty Cosmic Product LineView all Kelty Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

2 degrees (F) - ISO

Tested Comfort

16 degrees (F) - ISO

Temperature Rating (F)

2 degrees (F)

Temperature Rating (C)

-17 degrees (C)


20-denier nylon taffeta

Zipper Location


Insulation Type


Water-Resistant Down



80% duck down/20% polyester


50-denier polyester taffeta

Sleeping Bag Shape


Compressed Volume




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