How to Choose Sleeping Bags for Camping
Sea to Summit Basecamp Bt3 18 Sleeping Bag
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Accommodating sleepers who need room to stretch, the 3-season Sea to Summit Basecamp Bt3 25 sleeping bag has a contoured rectangular shape and a removable top that can be used on its own as a quilt.
Shop similar productsKey Details
Fill
Thermolite
Temperature Rating (F)
25 degrees (F)
- Fully zipped, the Basecamp Bt3 will keep you warm down to 25°F; for warmer nights unzip the bag on one or both sides for cooling ventilation
- The top layer can be completely removed for use as a quilt, or use the top by itself with a sleeping pad for an ultralight sleep system
- 2-layer offset construction uses high-quality Thermolite® synthetic insulation for maximum loft and warmth
- Sleeping pad (sold separately) slides into a pocket at the foot of the bag and secures with a loop strap
- The foot of the Basecamp can be unzipped for ventilation and has a roomy footbox that holds its shape, even when unzipped as a quilt
- Aeros pillow (sold separately) secures in place with an elastic strap under the insulated hood
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 Camping 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 | Camping |
|---|---|
| Tested Lower Limit | 25 degrees (F) - EN |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Shell | 30-denier nylon taffeta |
| Zipper Location | Left/Right |
| Insulation Type | Synthetic |
| Fill | Thermolite |
| Lining | 50-denier polyester |
| Sleeping Bag Shape | Semirectangular |
| Gender | Unisex |
