The semirectangular Sea to Summit Trek Tk II sleeping bag is a women-specific bag for 3-season use. The high-loft, water-resistant down delivers excellent warmth and compressibility.
Fill
650-fill-power Ultra-Dry duck down
Compressed Volume
6 liters
Temperature Rating (F)
18 degrees (F)
- 2D PermaShell™ nylon shell fabric is treated with a durable water repellent (DWR) finish, making the bag water-resistant and windproof
- Water-repellent Ultra-Dry Down™ is PFC-free and retains 60% more loft and absorbs 30% less moisture than untreated down
- 650-fill-power down is certified to the Responsible Down Standard (RDS); fill power and quality certified by the International Down and Feather Laboratory
- With a European Norm (EN) comfort rating of 18° F, the Tk II bag will help keep you warm on spring, summer and fall backpacking trips
- Updated technical hood and 3-dimensional sidewall that provides more space for the down to loft right to the edge of the bag
- Soft-touch lining fabric is downproof and highly breathable
- Thermolite® insulation in footbox baffles lends extra warmth
- Full-length side and foot zip allow the bag to zipped into the Sea to Summit Trek Tk II (sold separately) or converted from a 3-season bag to a summer comforter
- Baffle construction allows the down to remain fully lofted and keeps it from shifting
- Semirectangular shape provides more room than a mummy bag for a more comfortable sleeping bag while maintaining thermal efficiency
- Differentially cut inner layer is smaller than the outer layer to create a consistent thickness of insulation that precludes cold spots
- Internal security pocket keeps nighttime essentials close at hand
- Sea to Summit Trek Tk II bag comes with an Ultra-Sil compression sack and a nylon storage sack that can be used for drying the sleeping bag in a dryer
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 | 5 degrees (F) - EN |
| Tested Comfort | 18 degrees (F) - EN |
| Temperature Rating (F) | 18 degrees (F) |
| Temperature Rating (C) | -8 degrees (C) |
| Shell | 30-denier nylon |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 650-fill-power Ultra-Dry duck down |
| Fill Weight | 24.69 / 26.46 ounces |
| Lining | 20-denier nylon |
| Sleeping Bag Shape | Semirectangular |
| Stuff Sack Size | 7 x 16 inches |
| Stuff Sack Volume | 10 |
| Compressed Volume | 6 liters |
| Gender | Women's |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |