Rab Mythic Ultra 180 Sleeping Bag

$600.00to $620.00
Color: Black
please select a Size
Shipping restrictions may apply.

Delivering pioneering protection for those who need to make every gram count, the Rab Mythic Ultra 180 sleeping bag features 900+ fill-power down and heat-reflective Thermo Ionic Lining Technology.


  • 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


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 Backpacking Sleeping Bags

Technical Specs

Best Use


Tested Lower Limit

5 degrees (F) - ISO

Tested Comfort

35 degrees (F) - ISO

Temperature Rating (F)

32 degrees (F)

Temperature Rating (C)

0 degrees (C)


14.1 ounces





Zipper Location


Insulation Type


Water-Resistant Down



900+ fill-power goose down

Fill Weight

180 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

Regular - Left Zip: 6.3 x 12.6 inches

Long - Left Zip: 6.8 x 13 inches




Down certified to the Responsible Down Standard (RDS)

1 reviews with an average rating of 5.0 out of 5 stars

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