Sierra Designs Nitro 20 Sleeping Bag - Women's

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Color: Maroon/Black
Size: Regular
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Simple construction and a classic mummy shape are hallmarks of the women's Sierra Designs Nitro 20 sleeping bag. It's built for backpackers who value low weight, high comfort and straightforward tech.

  • Features

    • Designed with durable 15-denier ripstop nylon and insulated with PFC-free, hydrophobic DriDown™ 800-fill-power down to keep you toasty warm, even on damp nights
    • A draft collar seals in the heat when moving around, and 5 in. baffle spacing and sidewall baffles prevent the down from shifting and causing cold spots
    • Patented self-sealing foot vent provides relief to hot sleepers without the need to kick off the covers
    • Anti-snag zipper eliminates sleepy struggles and makes it easy to get in and out
    • Closeout


    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 Sierra Designs Backpacking Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    13 degrees (F) - ISO

    Tested Comfort

    25 degrees (F) - ISO

    Temperature Rating (F)

    20 degrees (F)

    Temperature Rating (C)

    -4 degrees (C)


    2 lbs. 2.5 oz.


    15-denier ripstop nylon

    Zipper Location


    Insulation Type


    Water-Resistant Down



    800-fill-power DriDown

    Fill Weight

    1 lb. 3.9 oz.


    15-denier ripstop nylon

    Sleeping Bag Shape


    Fits Up To (in.)

    68 inches

    Shoulder Girth (in.)

    58 inches

    Hip Girth (in.)

    58 inches

    Stuff Sack Size

    7.5 x 15 inches



  • Reviews
    2 reviews with an average rating of 2.5 out of 5 stars

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