Kelty Cosmic Down 21 Sleeping Bag

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This lightweight sleeping bag is insulated with water-resistant DriDown that resists moisture, has exceptional loft and compresses down small, making it a great bag for backpacking spring thru fall.

  • Features

    • 550-fill-power DriDown has a water-resistant finish that allows down insulation to resist moisture, dry faster and maintain loft
    • Box-baffle construction with differential cut and ground-level side seams provides maximum warmth and eliminates cold spots
    • Full draft collar drapes comfortably over neck and shoulders, sealing out drafts
    • Polyester taffeta creates a smooth yet durable shell; polyester taffeta lining breathes for comfort and feels great against skin
    • Formfitting hood has drawcords of differing widths at head and neck for easy identification and adjustment in the dark
    • Natural-fit footbox provides plenty of room so feet don't feel scrunched
    • Full-length, 2-way, double sliding zipper allows easy venting; locking slider is backed by antisnag binding tape
    • Fully insulated draft tube backing the zipper keeps body heat in and cold air out
    • Pad loops provide attachment points to keep sleeping bag centered on top of sleeping pad (pad and straps not included)
    • Hang loops allow easy drying and storage
    • 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 Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    21 degrees (F) - EN

    Tested Comfort

    32 degrees (F) - EN

    Temperature Rating (F)

    21 degrees (F)

    Temperature Rating (C)

    -7 degrees (C)


    50-denier polyester taffeta

    Zipper Location


    Insulation Type


    Water-Resistant Down



    550-fill DriDown


    50-denier polyester taffeta

    Sleeping Bag Shape




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