How to Choose Sleeping Bags for Backpacking
Big Agnes Fly Creek UL 25 Sleeping Bag
$499.95 – to $519.95
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 |
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5 months ago
Perfect bag for 30 degree nights
I used this sleeping bag for a 3 day adventure in the Eastern Sierra, mid summer but with much cooler evenings. I wore only my boxers while sleeping in it overnight and it was PERFECT. Not too hot or too cold, nights were hovering around 30-35F and this bag performed. It also passed the husky durability test. Our husky slept on it (on me) for part of the night and walked all around, no punctures or anything. I also really love and appreciate how far down the zipper goes for when I have to water the plants in the middle of the night. It packs down super small and is barely noticeable in my pack. This is my new go-to sleeping bag for all summer adventures.
Review originally posted on Big Agnes
6 months ago
Light and compact, but with a few issues
I love how compact and light the Fly Creek bag is. Unfortunately, I don't feel that it held up to it's temperature rating. I was fairly uncomfortable in this sleeping bag at just under 40 degrees. The center zip is nice for sleeping on your side without the zipper poking you, however it is too short to get in/out of the sleeping bag without shimmying up and down in and out. Another 9" would have made it so you could unzip past your knees and exit. When the zipper is pulled up all the way, the zipper pull tickles you in the face and makes you question whether a bug is biting your face. For the money, I think there are better options.
Review originally posted on Big Agnes
5 months ago
I recommend this product
Great summer bag Colorado's hi country ! great weight to warmth ratio .
Review originally posted on Big Agnes