Mountain Equipment Fireflash Sleeping Bag

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The warmest of the lightest bags Mountain Equipment makes, the Flashfire sleeping bag is the perfect companion for going fast and light in the mountains.

  • Features

    • Mountain Equipment's Good Night's Sleep rating for this bag is 7°F; this may tally closely to the EN/ISO rating, but for certain bags the discrepancy may be larger
    • The Good Night's Sleep temperature rating is based on laboratory and cold-chamber testing, plus extensive experience manufacturing sleeping bags for use in extreme conditions
    • 10-denier Plasma™ shell and lining fabric is an extremely lightweight downproof fabric that offers outstanding packability, comfort and breathability
    • Despite its tiny 26g/m2 fabric weight, it has exceptional tear resistance, giving you peace of mind on longer or more remote trips
    • 800-fill-power 23 oz. goose down has a minimum down/feather ratio of 90/10
    • Certified to the Down Codex® standard, which promotes transparency and animal welfare in the down supply chain
    • Alpine fit mummy bag provides lightweight warmth
    • EXL® system improves loft, comfort and thermal efficiency
    • Slanted box-wall baffles throughout reduce weight from the bag's structure
    • Ground-level side seams provide maximum performance
    • 7-baffle low-volume anatomically shaped hood; 4-baffle anatomically shaped and offset footbox
    • Full-length Gemini™ zip baffle
    • Waterproof roll-top stuff sack and storage cube included
    • Mountain Equipment is a member of Fair Wear Foundation, a European initiative working to improve workplace conditions in the garment and textile industry


    Mountain Equipment conducts their own laboratory and cold-chamber testing to give their bags a Good Night's Sleep temperature rating–a rating they feel is the most accurate reflection of a bag's potential in real-life situations.

    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 Mountain Equipment Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    18 degrees (F) - EN

    Tested Comfort

    30 degrees (F) - EN

    Temperature Rating (F)

    18 degrees (F)

    Temperature Rating (C)

    -8 degrees (C)




    10-denier Plasma nylon

    Zipper Location


    Insulation Type



    90/10 800-fill-power goose down


    10-denier Plasma nylon

    Sleeping Bag Shape


    Shoulder Girth (in.)

    60 inches

    Hip Girth (in.)

    52 inches

    Stuff Sack Volume

    10.5 liters

    Compressed Volume




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