Kelty Cosmic Down 40 Sleeping Bag

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Great for warm-weather backpacking, the 2-season Kelty Cosmic Down 40 sleeping bag features lofty 600-fill-power DriDown™ insulation that defends against moisture and still compresses small.

  • Features

    • Ripstop polyester creates a smooth yet durable shell; polyester taffeta lining breathes for comfort and feels great against skin
    • 600-fill-power DriDown has a water-resistant finish that allows down insulation to resist moisture, dry fast and maintain loft
    • 60 in. dual-slider locking zipper with antisnag design and draft tube to hold in warmth
    • Thermal comfort hood has drawcords of differing widths at head and neck for easy identification and adjustment in the dark
    • Off-set construction provides maximum warmth without cold spots
    • Full draft collar drapes comfortably over neck and shoulders, sealing out drafts
    • Natural-fit footbox provides plenty of room so feet don't feel scrunched
    • Stuff sack included


    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 all Kelty Backpacking Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    40 degrees (F) - EN

    Tested Comfort

    48 degrees (F) - EN

    Temperature Rating (F)

    40 degrees (F)

    Temperature Rating (C)

    4 degrees (C)


    50-denier ripstop polyester

    Zipper Location


    Insulation Type


    Water-Resistant Down



    600-fill DriDown


    50-denier polyester taffeta

    Sleeping Bag Shape


    Stuff Sack Size

    7 x 12 inches

    Stuff Sack Volume

    7.6 liters



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