Light, warm and comfortable, the versatile Sea to Summit Ascent AcIII 0 sleeping bag is surprisingly roomy for a mummy bag, while still providing the thermal efficiency you need above the treeline.
Fill
750-fill-power UltraDry Down
Temperature Rating (F)
0 degrees (F)
- Tapered rectangular shape creates the perfect balance of space and adaptable warmth
- 750-fill-power UltraDry Down™ certified to the Responsible Down Standard (RDS)
- Anatomically shaped footbox retains warmth around your feet
- Vertical chest baffles prevent down migration and cold spots
- Generously sized hood with dual cord adjustment offers maximum warmth retention
- Lightweight 20-denier nylon shell and lining fabrics offer a minimal packed size and maximum breathability
- Free-Flow half-zip on the right side; full-length, 2-way #5 YKK zip left side and separate foot zips allow maximum ventilation and use as a quilt
- Includes Ultra-Sil™ compression bag for compact storage
- Oversize draft tube with antisnag materials
- Oversize neck draft tube with dual adjustment system
- Large internal security pocket
- This bag is designed to easily zip with another (second sleeping bag not included)
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 Sea to Summit 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 | 0 degrees (F) - EN |
| Tested Comfort | 15 degrees (F) - EN |
| Temperature Rating (F) | 0 degrees (F) |
| Temperature Rating (C) | -10 degrees (C) |
| Shell | 20-denier nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 750-fill-power UltraDry Down |
| Lining | 20-denier nylon |
| Sleeping Bag Shape | Semirectangular |
| Stuff Sack Size | Unavailable |
| Stuff Sack Volume | Unavailable |
| Compressed Volume | Unavailable |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |