How to Choose Sleeping Bags for Backpacking
Big Agnes Fly Creek UL 25 Sleeping Bag
$499.95
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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.
Key Details
Fill
850-fill-power, PFC-free Downtek down
Weight
Regular - Center Zip: 1 lb. 10 oz.
Long - Center Zip: 1 lb. 12 oz.
Compressed Volume
Regular - Center Zip: 7.8 liters
Long - Center Zip: 8.2 liters
Temperature Rating (F)
25 degrees (F)
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- Big Agnes signature diamond quilting prevents down migration while using less stitching than traditional quilt lines, saving weight and providing better loft
- Ultralight ripstop nylon made from recycled fishing nets keeps weight low using durable and sustainable fabric
- Minimalist hood with low-profile cordlock keeps your head warm without restricting breathing room; cordlock is made with renewably sourced materials from organic waste
- Mummy fit reduces bag volume, allowing your body to heat the bag to a comfortable temperature more quickly
- Insulated zipper and draft collar lock in warmth and increase thermal efficiency
- Ultralight half-length center zipper keeps weight low and provides easy temperature regulation
- Antisnag YKK #3 zippers for a smooth, quick zip
- Ergonomic footbox construction provides more loft and better fit for warmer toes on cold nights
- Includes a mesh sack ideal for long-term storage and a smaller stuff sack for active use
- To pack bag down to its minimum compressed size, Big Agnes recommend pairing it with a Big Agnes compression stuff sack or superlight girdle (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 the Big Agnes Fly Creek Product LineView all Big Agnes 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 | 25 degrees (F) - ISO |
| Tested Comfort | 35 degrees (F) - ISO |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Weight | Regular - Center Zip: 1 lb. 10 oz. Long - Center Zip: 1 lb. 12 oz. |
| Ultralight | Yes |
| Shell | Ultralight recycled 10-denier ripstop nylon with a water-repellent finish without intentionally added PFAS; fabric made from recycled fishing nets |
| Zipper Location | Front |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850-fill-power, PFC-free Downtek down |
| Fill Weight | Regular - Center Zip: 1 lb. 1 oz. Long - Center Zip: 1 lb. 3 oz. |
| Sleeping Capacity | 1-person |
| Lining | 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 |
| Fits Up To (in.) | Regular - Center Zip: 72 inches Long - Center Zip: 78 inches |
| Shoulder Girth (in.) | Regular - Center Zip: 60 inches Long - Center Zip: 63 inches |
| Hip Girth (in.) | Regular - Center Zip: 54 inches Long - Center Zip: 57 inches |
| Stuff Sack Size | Regular - Center Zip: 7.5 x 15 inches Long - Center Zip: 7.5 x 16 inches |
| Stuff Sack Volume | 10 liters |
| Compressed Volume | Regular - Center Zip: 7.8 liters Long - Center Zip: 8.2 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) Contains recycled materials |
