Marmot Always Summer 40 Sleeping Bag - Men's

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For traveling light in summer, the lightweight men's Marmot Always Summer bag provides reliable transport to dreamland. Even though it's just over 2 packable pounds, it doesn't skimp on features.

  • Features

    • Fold-Down Second Zipper Provides added Ventilation and Easy Access, Main Zipper Anti-Snag Slider reduces Snagging
    • Anatomical Wrap-Around Footbox Increases Insulation and Room for Your Feet, More Warmth and Comfort
    • Certified 650-Fill-Power Down with Down Defender to Improve Water-Resistance in Wet Conditions
    • Nautilus Multi-Baffle Hood
    • Down-filled Collar with Easy Access Draw Cord
    • Full Length Locking YKK Two Way Zipper with Draft Tube to Reduce Heat Loss
    • Internal Stash Pocket and Heater Pocket in Footbox


    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 Marmot Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    33.8 degrees (F) - EN

    Tested Comfort

    42.4 degrees (F) - EN

    Temperature Rating (F)

    42.4 degrees (F)

    Temperature Rating (C)

    4 degrees (C)


    20-dennier mini ripstop nylon

    Zipper Location


    Insulation Type



    650-fill duck down


    20-denier nylon plain weave

    Sleeping Bag Shape


    Stuff Sack Size

    7 x 14 inches

    Stuff Sack Volume

    8.8 liters




    Down certified to the Responsible Down Standard (RDS)

  • Reviews
    29 reviews with an average rating of 4.8 out of 5 stars

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