How to Choose Sleeping Bags for Backpacking
Rab Mythic Ultra 180 Sleeping Bag
$600.00 – to $650.00
Extremely warm for its weight, the Rab Mythic Ultra 180 Sleeping Bag redefines what is possible. Its 900-fill-power down insulation keeps you warm on nights that dip below 50°F.
Key Details
Fill
900-fill-power European goose down with Nikwax fluorocarbon-free hydrophobic finish
Weight
Regular - Left Zip: 15.5 oz.
Long - Left Zip: 1 lb. 0.93 oz.
Temperature Rating (F)
30 degrees (F)
- Weight-saving baffle construction prevents down migration and shifting
- Trapezoidal box-wall construction to maximize loft and warmth
- Proportionally designed differential cut
- Ergonomically designed internal collar and hood
- 1/8-length YKK 3 coil main zipper with night-visible puller
- Antisnag bonded zipper guard
- Angled footbox for relaxed sleeping posture
- Includes a lightweight dry bag compression stuff sack
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 | 35.6 degrees (F) - ISO |
| Tested Comfort | 44.6 degrees (F) - ISO |
| Temperature Rating (F) | 30 degrees (F) |
| Temperature Rating (C) | -1.11 degrees (C) |
| Weight | Regular - Left Zip: 15.5 oz. Long - Left Zip: 1 lb. 0.93 oz. |
| Ultralight | Yes |
| Shell | Recycled nylon with fluorocarbon-free durable water repellent (DWR) |
| Zipper Location | Regular - Left Zip: Left Long - Left Zip: Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 900-fill-power European goose down with Nikwax fluorocarbon-free hydrophobic finish |
| Fill Weight | Regular - Left Zip: 6.35 ounces Long - Left Zip: 7.41 ounces |
| Sleeping Capacity | 1-person |
| Lining | Recycled polyester with fluorocarbon-free DWR |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular - Left Zip: 72.8 inches Long - Left Zip: 78.7 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 | 6.3 x 12.6 inches |
| Stuff Sack Volume | Unavailable |
| Compressed Volume | Unavailable |
| Gender | Unisex |
| Sustainability | Contains recycled materials |
