Kelty Cosmic Down 0 Sleeping Bag - Long

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Camp in cozy comfort and in any weather with the 3-season Kelty Cosmic Down 0 long 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


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 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)


4 lbs. 0.7 oz.


20-denier nylon taffeta

Zipper Location


Insulation Type


Water-Resistant Down



600-fill-power DriDown

Fill Weight

2 lbs. 3 oz.


50-denier polyester taffeta

Sleeping Bag Shape


Fits Up To (in.)

78 inches

Shoulder Girth (in.)

64 inches

Hip Girth (in.)


Stuff Sack Size

10 x 22.5 inches

Stuff Sack Volume

29 liters

Compressed Volume




43 reviews with an average rating of 4.2 out of 5 stars

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