How to Choose Sleeping Bags for Backpacking
Big Agnes Sidney 25 Sleeping Bag - Women's
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Featuring 650-fill-power, water-resistant down, the Big Agnes Sidney 25 sleeping bag lets you customize its length and width based on temps, maximizing warmth and mobility without sacrificing weight.
Shop similar productsKey Details
Fill
650-fill-power DownTek down
Temperature Rating (F)
25
- Exterior cinch and hook-and-loop closures let you decide the length and width based on temperature or how you sleep, maximizing warmth and mobility without sacrificing weight
- DownTek insulation absorbs 30% less water and dries 60% faster than untreated down, and retains significantly more loft than untreated down after exposure to moisture
- Included REM Pad Sleeve™ secures your bag to the pad so you don't roll off the pad at night; REM pad sleeve detaches and doubles as a storage sack
- Thermally efficient vertical structured sidewalls trap heat close to your body while the contoured shape of the hood cradles your head in lofty comfort
- Traditional mummy shape allows for light weight and increased thermal value
- Superlight, soft-shell fabric with high tear strength and Insotect Flow construction
- Interior zippered stash pocket
- Vaulted footbox creates more wiggle room for your feet
- Contoured hood baffles cradle your head for a comfortable fit
- Low-profile cordlock lets you un-cinch the hood with only one hand
- Oversized interior anti-draft collar
- 70 in. (178cm) YKK #8 antisnag zipper with zipper garage
- Interior fabric loops for sleeping bag liners; exterior loops for hang drying or storage
- Includes a mesh storage sack and nylon stuff sack
- Mate together left and right zip bags
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 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 | 10 degrees (F) - EN |
| Tested Comfort | 22 degrees (F) - EN |
| Temperature Rating (F) | 25 |
| Temperature Rating (C) | -4 |
| Shell | Ripstop nylon |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 650-fill-power DownTek down |
| Lining | Nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 7.5 x 15 inches |
| Stuff Sack Volume | 11 liters |
| Gender | Women's |
