How to Choose Sleeping Bags for Backpacking
Western Mountaineering AlpinLite 20 Sleeping Bag
$710.00 – to $730.00
Wide, warm and packed with features, the 3-season Western Mountaineering AlpinLite 20 sleeping bag is a favorite among ultralight backpackers.
Key Details
Fill
850+ fill-power goose down
Weight
6 FT Left Zip: 1 lb. 15 oz.
6 FT 6 IN Left Zip: 2 lbs. 1 oz.
Compressed Volume
6 FT Left Zip: 8.6 liters
6 FT 6 IN Left Zip: 9.4 liters
Temperature Rating (F)
20 degrees (F)
- 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. 6 FT 6 IN Left Zip: 2 lbs. 1 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. 6 FT 6 IN Left Zip: 1 lb. 5 oz. |
| Sleeping Capacity | 1-person |
| Lining | Nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 6 FT Left Zip: 72 inches 6 FT 6 IN Left Zip: 78 inches |
| Shoulder Girth (in.) | 6 FT Left Zip: 64 inches 6 FT 6 IN Left Zip: 65 inches |
| Hip Girth (in.) | 6 FT Left Zip: 55 inches 6 FT 6 IN Left Zip: 56 inches |
| Stuff Sack Size | 8 x 15 inches |
| Stuff Sack Volume | 6 FT Left Zip: 8.6 liters 6 FT 6 IN Left Zip: 9.4 liters |
| Compressed Volume | 6 FT Left Zip: 8.6 liters 6 FT 6 IN Left Zip: 9.4 liters |
| Gender | Unisex |
Buying Advice
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Fogline
Jury still out
2 days ago
I have been camping on the Pacic coast by bicycle. The weight is amazing, craftsmanship unassailable. Though I find the bag comfortable, I have woken cold in the middle of the night because the down shifted. If I can learn how to keep the down where it is supposed to be, I will like it. But I don't today and I am in my 6th week camping on the Pacific coast.
sbennett3705
Chicago
Outstanding bag
1 month ago
Excellent craftsmanship and thoughtful design. No gimmicks, just a functional item that simply works. Haven’t tested it below 32 degrees, but it seems accurately rated. As noted elsewhere, the zipper is outstanding, no stress getting in or out. The hood is well designed with a super efficient draft collar. Ample footbox provide comfort, seems over stuffed for warmth. The dimensions are just right for me (6’ 180 lbs), allows side sleeping without the bag fighting the constant turns, but not so loose it wastes efficiency. I sold two bags/quilts (10 deg and 25 deg) to finally get the right one.
Age:65–74
Weight:175–200 lbs.
Height:6'0"
Yes , I recommend this product