Trek 15F Sleeping Bag
Price range: $331.99 through $355.99
The flexibility of the Free-Flow Zip System—which lets you use it a quilt or wear it—plus its roomy shape make the Sea to Summit Trek 15F sleeping bag a comfy choice in cool conditions.
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 | 15 degrees (F) – ISO, 15 degrees (F) – ISO |
| Tested Comfort | 27 degrees (F) – ISO, 27 degrees (F) – ISO |
| Temperature Rating (F) | 15 degrees (F), 15 degrees (F) |
| Temperature Rating (C) | -9 degrees (C), -9 degrees (C) |
| Weight | 3 lbs. 2.7 oz., 3 lbs. 8.8 oz. |
| Shell | 100% RCS recycled polyester, 100% RCS recycled polyester |
| Zipper Location | Left/Right, Left/Right |
| Insulation Type | Down, Down |
| Water-Resistant Down | Yes, Yes |
| Fill | 650+ fill-power duck down, 650+ fill-power duck down |
| Fill Weight | 1 lb. 6.4 oz., 1 lb. 9.9 oz. |
| Sleeping Capacity | 1-person, 1-person |
| Lining | 100% RCS recycled polyester, 100% RCS recycled polyester |
| Sleeping Bag Shape | Semirectangular, Semirectangular |
| Fits Up To (in.) | 72.5 inches, 77.5 inches |
| Shoulder Girth (in.) | 62.2 inches, 66.1 inches |
| Hip Girth (in.) | 58.7 inches, 62.6 inches |
| Stuff Sack Volume | 20 liters, 20 liters |
| Compressed Volume | 10.6 liters, 12.2 liters |
| Gender | Unisex, Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS), Contains recycled materials, Down certified to the Responsible Down Standard (RDS), Contains recycled materials |
| Color | Snorkel Blue |
|---|---|
| Size | Regular, Long |
| Brand | Sea to Summit |
