Rab Mythic Ultra 360 Sleeping Bag

$650.00 to $675.00
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With 900+ fill-power down and heat-reflective Thermo Ionic Lining Technology, the Rab Mythic Ultra 360 sleeping bag delivers pioneering protection for those who need to make every gram count.

  • Features

    • Shell fabric is superlightweight 7-denier ripstop nylon
    • Liner fabric is superlightweight 7-denier ripstop nylon with heat-reflecting Thermo Ionic Lining Technology (TILT) to boost warmth
    • 900+ fill-power European goose down with Nikwax fluorocarbon-free hydrophobic finish
    • Down is RDS-certified
    • Weight-saving baffle construction prevents down shifting and migration
    • Trapezoidal chamber design helps to eliminate cold spots
    • Proportionally designed differential cut
    • Antisnag bonded zip guard
    • Angled foot box


    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 Rab Men's Sleeping Bags
  • Technical Specs

    Best Use


    Tested Lower Limit

    -17 degrees (F) - ISO

    Tested Comfort

    28 degrees (F) - ISO

    Temperature Rating (F)

    20 degrees (F)

    Temperature Rating (C)

    -7 degrees (C)


    1 lb. 5.4 oz.





    Zipper Location


    Insulation Type


    Water-Resistant Down



    900+ fill-power goose down

    Fill Weight

    360 grams



    Sleeping Bag Shape


    Fits Up To (in.)

    Regular - Left Zip: 74.8 inches

    Long - Left Zip: 78.8 inches

    Shoulder Girth (in.)

    Regular - Left Zip: 63 inches

    Long - Left Zip: 63.8 inches

    Hip Girth (in.)

    Regular - Left Zip: 52.8 inches

    Long - Left Zip: 53.5 inches

    Stuff Sack Size

    7.1 x 14.2 inches




    Down certified to the Responsible Down Standard (RDS)

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

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