Kelty Cosmic Synthetic 40 Sleeping Bag

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A fully equipped mummy bag that's light on weight and your wallet, the Kelty Cosmic Synthetic 40 sleeping bag is a 3-season superstar with CirroLoft synthetic fill for light, compressible warmth.

  • Features

    • 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 Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    27 degrees (F) - ISO

    Tested Comfort

    37 degrees (F) - ISO

    Temperature Rating (F)

    27 degrees (F)

    Temperature Rating (C)

    -2.8 degrees (C)


    20-denier 380T nylon taffeta

    Zipper Location


    Insulation Type



    CirroLoft synthetic fibers


    50-denier 300T poly taffeta

    Sleeping Bag Shape


    Stuff Sack Size

    8.5 x 15 inches

    Stuff Sack Volume

    13.95 liters



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