Big Agnes Sarvis SL 20 Sleeping Bag - Women's

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Designed for mummy bag sleepers who don't want to roll off their sleeping pad, the women's Big Agnes Sarvis SL 20 sleeping bag is a versatile companion for multi-night treks and weekend road trips.

  • Features

    • 650-fill-power PFC-free DownTek™ water-repellent down insulation keeps you cozy and warm
    • Women-specific sleeping bag helps enhance warmth with a different fill weight and less-drastic taper from shoulders to feet
    • Half-length REM Flex Pad Sleeve™ attaches to your 20 or 25 in. wide pad (not included) and gives your legs more freedom to flop around; sleeve doubles as a storage sack
    • External clips adjust both length and width to minimize cold air spots and maximize heat retention
    • Exterior clip system at foot adjust length by up to 10 in., making this bag ideal for preteen campers to grow into through their college years
    • Thermally efficient, vertical structured sidewalls trap heat close to your body while the contoured hood baffles cradle your head in lofty comfort
    • Traditional mummy shape allows for light weight and increased thermal value
    • Vaulted footbox creates more wiggle room for your feet; cinch cold air out with the built-in internal cinch system
    • Oversize interior anti-draft collar
    • Insulated tube along upper hood opening seals out drafts when cinched; low-profile cordlock lets you uncinch the hood with one hand
    • Internal mesh stash pocket stows your phone and other little essentials
    • Shell fabric has a durable water repellent (DWR) finish that helps moisture bead up on the surface
    • Zip together left-zip and right-zip bags to make a double sleeping bag (additional bags not included)
    • Interior fabric loops let you attach a sleeping bag liner (not included); exterior loops for hang drying or storage
    • Includes storage sack and stuff sack


    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 Big Agnes Women's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    8 degrees (F) - ISO

    Tested Comfort

    20 degrees (F) - ISO

    Temperature Rating (F)

    20 degrees (F)

    Temperature Rating (C)

    -7 degrees (C)


    Ripstop polyester

    Zipper Location


    Insulation Type


    Water-Resistant Down



    Polyester taffeta


    Polyester taffeta

    Sleeping Bag Shape


    Stuff Sack Size

    8 x 17.5 inches

    Stuff Sack Volume

    14.4 liters



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