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)
This item pays for membership!
$73
10% Reward
on this and every eligible full-price item*
+
$30
Bonus Card
valid for 60 days after joining*
=
$103
Value
Start earning when you buy a $30 lifetime membership.
Keep shopping
- 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
Review this Product
Adding a review will require a valid email for verification
msbr
Quilts Vs Sleeping Bags.
10 months ago
If you're over 180lbs, go for the wider Alpinlite. I have 4 camping nights on it and 12 Refugio nights in Nepal so far and it's fantastic. Also, even if you're 6ft, get the 6'6" version as your feet will point "down" when you lay down and it will be nice to have the extra toe room. Here's the underrated aspect of this bag. You can EASILY redistribute the down by unzipping the bag and vigorously shaking the down in the direction you want it to go. 2-3 shakes (like shaking dust of a small rug) and you'll go from a 20F bag to a 40F (?) rated bag; appropriate for a warmer night. This takes some practice and you may have to bring some down back over by brushing it back over with your hand. Overall, this is a major advantage over vertical baffles. The bag is accurately rated and be wary of the exuberant WM fan boys who think this thing is comfortable down to 10F. It's not and even WM says that. More knowledge. 850+ down is what you want, as 1000 fill power is the finest of the finest down, but it doesn't keep the sleeping bag baffles as resistant to you tossing and turning, elbows poking it etc. 850 is lofty, but it can handle physical stresses better. Also WM doesn't use water resistant coatings on it's down because they believe down already has it's own oils that help resist high humidity situations. I have used both and I'm not sure I can even tell the difference. I use quilts primarily but under 30F I give up on them (due to drafts) and go to sleeping bags. However, WM does a REALLY good job at getting close to the weights of quilts. Take the 30F WM Megalite. The Megalite is only 2-3oz heavier than a Katabatic 30F quilt with it's required quilt straps.
Weight:200–225 lbs.
Height:6'1"
Yes , I recommend this product
sbennett3705
Chicago
Outstanding bag
3 days 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