Wide, warm and packed with features, the 3-season Western Mountaineering AlpinLite 20 sleeping bag is a favorite among ultralight backpackers.
Fill
850+ fill-power goose down
Weight
6 FT Left Zip: 1 lb. 15 oz.
Compressed Volume
6 FT Left Zip: 8.6 liters
Temperature Rating (F)
20 degrees (F)
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- The AlpinLite is a wide version of the popular UltraLite sleeping bag
- Filled with 850+ fill-power, ethically sourced premium goose down
- Continuous baffles allow you to shift down for more insulation in colder weather
- Full-length #5 YKK zipper provides a smooth, easy unzipping experience while saving weight
- Insulated draft tube blocks cold air and keeps the torso better insulated
- Breathable 12-denier ripstop nylon outer shell makes the bag ultralight yet durable
- Fully insulated draft collar seals in inner heat without adding much weight
- Comes with ultralight stuff sack and breathable mesh storage bag
Made in USA.
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 Western Mountaineering 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 | 14 degrees (F) - ISO |
| Tested Comfort | 25 degrees (F) - ISO |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Weight | 6 FT Left Zip: 1 lb. 15 oz. |
| Ultralight | Yes |
| Shell | Nylon ripstop |
| Zipper Location | Left |
| Insulation Type | Down |
| Fill | 850+ fill-power goose down |
| Fill Weight | 6 FT Left Zip: 1 lb. 3 oz. |
| Sleeping Capacity | 1-person |
| Lining | Nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 6 FT Left Zip: 72 inches |
| Shoulder Girth (in.) | 6 FT Left Zip: 64 inches |
| Hip Girth (in.) | 6 FT Left Zip: 55 inches |
| Stuff Sack Size | 8 x 15 inches |
| Stuff Sack Volume | 6 FT Left Zip: 8.6 liters |
| Compressed Volume | 6 FT Left Zip: 8.6 liters |
| Gender | Unisex |