Ascent 0 Sleeping Bag
Price range: $312.99 through $328.99
For backpacking in cold weather, this Rab down sleeping bag provides reliable warmth. It has a wide mummy shape and roomy footbox for sleeping comfort. The 650-fill-power down is light and warm.
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.
| Best Use | Backpacking, Backpacking |
|---|---|
| Tested Lower Limit | 0 degrees (F) – ISO, 0 degrees (F) – ISO |
| Tested Comfort | 14 degrees (F) – ISO, 14 degrees (F) – ISO |
| Temperature Rating (F) | 0 degrees (F), 0 degrees (F) |
| Temperature Rating (C) | -17 degrees (C), -17 degrees (C) |
| Weight | 3 lbs. 10.2 oz., 3 lbs. 12.32 oz. |
| Shell | 20-denier Pertex® Quantum ripstop, 38 g/m², 20-denier Pertex® Quantum ripstop, 38 g/m² |
| Zipper Location | Left, Left |
| Insulation Type | Down, Down |
| Water-Resistant Down | Yes, Yes |
| Fill | 650-fill-power European duck down, 650-fill-power European duck down |
| Fill Weight | 1 lb. 15 oz., 2 lbs. 0.63 oz. |
| Sleeping Capacity | 1-person, 1-person |
| Lining | Recycled 20-denier nylon, 38 g/m², Recycled 20-denier nylon, 38 g/m² |
| Sleeping Bag Shape | Mummy, Mummy |
| Fits Up To (in.) | 72.8 inches, 79 inches |
| Shoulder Girth (in.) | 63 inches, 68 inches |
| Hip Girth (in.) | 52.8 inches, 56 inches |
| Stuff Sack Size | 10.24 x 17.72 inches, 10.24 x 17.72 inches |
| Stuff Sack Volume | Unavailable, Unavailable |
| Compressed Volume | Unavailable, Unavailable |
| Gender | Unisex, Unisex |
| Color | Tempest Blue/Maya Blue |
|---|---|
| Size | Regular – Left Zip, Long – Left Zip |
| Brand | Rab |
