How to Choose Sleeping Bags for Backpacking
Big Agnes Boot Jack 25 Sleeping Bag - Men's
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Ideal for backpacking but versatile enough for couch surfing, the Big Agnes Boot Jack 25 sleeping bag features down insulation and baffle construction so you can stay warm while traveling light.
Shop similar productsKey Details
Fill
600-fill DownTek
Temperature Rating (F)
18 degrees (F)
- Traditional mummy shape, DownTek™ insulation and baffle construction provide efficient heat retention
- 600-fill-power DownTek water-repellent down is PFC-free
- Contoured hood follows the shape of your head for a comfortable fit; low-profile cordlock lets you uncinch the hood with one hand
- Breathable shell fabric features a water-repellent finish
- No-draft oversize collar and no-draft zipper help seal out cold air
- 2-way YKK #5 antisnag locking zipper with zipper garage offers a smooth, quick zip
- Designed to zip together with right zip bags (sold separately)
- Liner loops let you attach a sleeping bag liner and help keep it in place (liner not included)
- Exterior loops are for hang drying or storage
- Works with any pad size or style (sold separately)
- Comes with mesh storage sack and nylon stuff sack
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 | 18 degrees (F) - EN |
| Tested Comfort | 29 degrees (F) - EN |
| Temperature Rating (F) | 18 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Shell | Ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 600-fill DownTek |
| Lining | Nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 8 x 17.5 inches |
| Stuff Sack Volume | 14.4 liters |
| Gender | Men's |
