Kelty Cosmic Synthetic 0 Sleeping Bag

This product is not available.

Shop similar products

When you curl up in the Kelty Cosmic Synthetic 0 sleeping bag, you'll think less about your weary feet and more about tomorrow's adventure. It's cozy, soft and light on weight (and your wallet).


  • Buttery-soft and durable nylon shell has a PFC-free durable water repellent (DWR) finish that helps repel moisture to keep you warm and dry inside
  • Light, compressible CirroLoft synthetic insulation keeps the overall weight of the bag low without skimping on warmth
  • Natural-fit spacious footbox gives you more room to wiggle your toes
  • Handy stash pocket gives you a spot to keep your headlamp, cellphone or other small essentials close by
  • Included compression stuff sack helps you compact the bag so it takes up less space in your pack


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

5 degrees (F) - ISO

Tested Comfort

18 degrees (F) - ISO

Temperature Rating (F)

5 degrees (F)

Temperature Rating (C)

-15 degrees (C)


20-denier 380T nylon taffeta

Zipper Location


Insulation Type



Cirroloft synthetic fibers


50-denier 300T polyester taffeta

Sleeping Bag Shape


Stuff Sack Size

17 x 11 inches

Stuff Sack Volume

26.5 liters



6 reviews with an average rating of 4.7 out of 5 stars

Loading Reviews...

Questions & Answers

Loading Questions...