Fly Creek UL 25 Sleeping Bag
Price range: $399.99 through $415.99
For minimalist missions where saving weight is a priority, pack the Big Agnes Fly Creek UL 25 sleeping bag. It warms with lofty 850-fill-power down in an ultralight, thermally efficient design.
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 | 25 degrees (F) – ISO, 25 degrees (F) – ISO |
| Tested Comfort | 35 degrees (F) – ISO, 35 degrees (F) – ISO |
| Temperature Rating (F) | 25 degrees (F), 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C), -4 degrees (C) |
| Weight | 1 lb. 10 oz., 1 lb. 12 oz. |
| Ultralight | Yes, Yes |
| Shell | Ultralight recycled 10-denier ripstop nylon with a water-repellent finish without intentionally added PFAS; fabric made from recycled fishing nets, Ultralight recycled 10-denier ripstop nylon with a water-repellent finish without intentionally added PFAS; fabric made from recycled fishing nets |
| Zipper Location | Front, Front |
| Insulation Type | Down, Down |
| Water-Resistant Down | Yes, Yes |
| Fill | 850-fill-power, PFC-free Downtek down, 850-fill-power, PFC-free Downtek down |
| Fill Weight | 1 lb. 1 oz., 1 lb. 3 oz. |
| Sleeping Capacity | 1-person, 1-person |
| Lining | Ultralight recycled 10-denier ripstop nylon with a water-repellent finish without intentionally added PFAS; fabric made from recycled fishing nets, Ultralight recycled 10-denier ripstop nylon with a water-repellent finish without intentionally added PFAS; fabric made from recycled fishing nets |
| Sleeping Bag Shape | Mummy, Mummy |
| Fits Up To (in.) | 72 inches, 78 inches |
| Shoulder Girth (in.) | 60 inches, 63 inches |
| Hip Girth (in.) | 54 inches, 57 inches |
| Stuff Sack Size | 7.5 x 15 inches, 7.5 x 16 inches |
| Stuff Sack Volume | 10 liters, 10 liters |
| Compressed Volume | 7.8 liters, 8.2 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 | Asphalt/Royal Purple |
|---|---|
| Size | Regular – Center Zip, Long – Center Zip |
| Brand | Big Agnes |
