How to Choose Sleeping Bags for Backpacking
Rab Mythic Ultra 180 Sleeping Bag
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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.
Shop newer versionKey Details
Fill
900+ fill-power goose down
Weight
14.1 ounces
Temperature Rating (F)
32 degrees (F)
- 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
Imported.
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 BagsEach 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.
| Best Use | Backpacking |
|---|---|
| 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) |
| Weight | 14.1 ounces |
| Ultralight | Yes |
| Shell | Nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 900+ fill-power goose down |
| Fill Weight | 180 grams |
| Sleeping Capacity | 1-person |
| Lining | Nylon |
| Sleeping Bag Shape | Mummy |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
