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No, you're not dreaming. The new Marmot Plasma +30°F sleeping bag comes in under 1.5 lbs. with 900-fill-power goose down—summer backpacking season can't get here soon enough!

  • Features

    • Citing this Editors' Choice winner, the April 2011 issue of Backpacker claimed, "In the quest for maximum warmth at minimum weight, we have a new standard setter"
    • Filled with certified, super-lofty, ultralight, 900-fill-power goose down (the largest down cluster with the lowest trace of feather) for an unsurpassed warmth-to weight ratio
    • Flow Gate Construction lets you manually shift the down to preferred locations—move it to cold spots, customizing warmth to your personal sleep preference
    • Pertex® Quantum nylon ripstop shell is lightweight and durable, and offers silky softness that enhances the insulation's loft
    • Shell is treated with a Durable Water Repellent finish that causes moisture to bead up and roll off
    • Hood drawcord and insulated collar envelops your head and shoulders in warmth; down gasket face muff lets you cinch the hood snug without it digging into your face
    • Vertical baffles prevent cold spots by keeping the goose down fully lofted and in place
    • Down-insulated draft tube backs the 2-way, full-length zipper to keep the cold out
    • Wrap-around footbox construction reduces down compression; Flow design with the classic trapezoidal foot box shape lets feet move freely and keeps down lofted for warmth
    • Zipper guard runs the entire length of the draft tube to prevent fabric from getting caught in zipper
    • Marmot Plasma sleeping bag features an ultralight stuff sack and storage bag
    • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags


    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

    33.6 degrees (F) - EN

    Tested Comfort

    42.4 degrees (F) - EN

    Temperature Rating (F)

    33 degrees (F)

    Temperature Rating (C)

    0.5 degrees (C)



    Insulation Type



    900-fill goose down



    Sleeping Bag Shape


    Stuff Sack Size

    7 x 15

    Stuff Sack Volume

    9.5 liter



  • Reviews
    7 reviews with an average rating of 4.7 out of 5 stars

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