Rab Mythic Ultra 360 Sleeping Bag

$750.00to $770.00
Color: Cloud/Graphene
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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.


  • 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 from shifting and migrating
  • Trapezoidal chamber design helps to eliminate cold spots
  • Proportionally designed differential cut
  • Antisnag bonded zip guard
  • Angled foot box


Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Rab Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

18 degrees (F) - ISO

Tested Comfort

28 degrees (F) - ISO

Temperature Rating (F)

18 degrees (F)

Temperature Rating (C)

-7.8 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)

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

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