How to Choose Sleeping Bags for Backpacking
REI Co-op Expedition -20 Sleeping Bag
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Stay at low camp or high camp in the REI Expedition -20°F sleeping bag featuring goose down insulation, a water-resistant/breathable shell and a double zipper system for temperature fluctuations.
Shop similar productsKey Details
Fill
800/700-fill goose down
Temperature Rating (F)
-20 degrees Fahrenheit
- Unique double zipper system allows you to adjust comfort as needed—fully close both zippers to increase warmth, open inner zipper to decrease warmth
- Goose down is efficiently distributed for maximum warmth and compressibility—800-fill-power goose down on top and 700-fill-power goose down underneath
- Exclusive REI Down Fill Calculator optimizes the amount of down per baffle for the most warmth with the least amount of down
- Ultralight ripstop nylon shell fabric was specifically designed to dissipate moisture from the inside, as well as repel moisture from the outside, keeping the down dry
- In-the-round pattern wraps vertical baffles around perimeter of sleeping bag, from head to foot, creating a 3-dimensional bag that wraps you in warmth
- Baffle spacing is optimized to keep down in place and prevent cold spots
- Multi-chambered hood and anatomically-contoured, insulated draft collar seal in heat; trapezoidal footbox mirrors sleeping position for room to move and thermal efficiency
- A pass-through pocket with zipper access on both outside and inside provides a convenient way to get to your stashed essentials such as eyewear and headlamp
- Includes nylon stuff sack and large cotton storage bag
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
Imported.
View all REI Co-op Backpacking Sleeping Bags| Best Use | Backpacking |
|---|---|
| Temperature Rating (F) | -20 degrees Fahrenheit |
| Temperature Rating (C) | -29 degrees Celsius |
| Shell | Ripstop nylon |
| Insulation Type | Down |
| Fill | 800/700-fill goose down |
| Lining | Ripstop polyester |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 9 x 20 inches |
| Gender | Unisex |
| Sustainability | From a Climate Label Certified brand |
Buying Advice
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
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Russp17
Anchorage, AK
Good Bag
13 years ago
I like this bag. I've used it on a variety of backcountry winter trips ranging from the Wrangells to the Alaska Range. This past weekend the temp dropped to below -25 degrees and with a nano puff jacket and base layers on I was toasty warm all night. I agree it is not up the level of a Feathered Friends bag or Western Mountainering, but for backcountry skiing and camping in Alaska I don't think you can get more bang for your buck. I think I could easily use this bag down to -30 with just a little clothes on. For winter camping and mountaineering I think you would be hard to find a better bag for the money. (I got mine in the gear closet for [$])
Yes , I recommend this product
Goshenprong
Murfreesboro, Tennessee
Luxurious
12 years ago
I have used this bag for nearly three years, including the Appalachian Mountains, the Pecos Mountains, and Snowdonia, Wales. I only camp in cold weather, so a warm bag is a necessity. In the Pecos Mountains I camped a week. The temperature never got above 0 degrees. Spent a week in Snowdonia, with gale force winds and snow for several days. In this bag, I never got cold. It feels luxurious, has incredible loft, and feels like it is worth a thousand dollars. I'm 52 and a bit overweight. The bag is a bit tight on me, but on an average sized man, it would be just the right fit. I got the long; you can bury yourself in it.
Yes , I recommend this product
Kriz
Arizona
My first winter bag
13 years ago
Used this bag on a mountaineering trip above 10, 000 ft. Temperatures got down to about 5 degrees F and I stayed *toasty* warm. I'm 5 ft 2 inches tall and the short length was perfect for me- I had a little extra room in the foot box, just how I like. I could snugly fit a water bottle at my feet to keep it from freezing overnight. -20 deg F is a men's rating, so I'll plan to use this down to about -10 deg worst case as a female. Also, the shoulder area is a bit wide for a female but I did not find it to be an issue. The hip area was wide enough and I did not feel constrained.
Yes , I recommend this product
Inupiaq
Anchorage,Ak.
Sleeping Good In the IglooHood.
11 years ago
The coldest I've slept in this bag was Minus seven degrees below zero,i woke up a little chilly but i am still alive so no complaints from me I would recommend this bag to a friend just keep it clean and dry,once i've used a bivy with the bag and woke with the entire outer layer of the bag wet from condensation but it still kept me alive...Thank you REI.just dont get the inside wet,sometimes i walk by the creeks here in Anchorage Ak during the winter and see the ducks sitting on the water and wonder what keeps their feets from freezing?
Yes , I recommend this product
High Desert
Reno, NV
Very good not not perfect
12 years ago
I bought this bag because I needed a serious bag when the high desert turns cold at times. Like others here, this is not a -20º bag. I have spent four nights out in near -20º weather and I was cold. I was wearing the proper sleeping gear and had the bag off the ground and on a cot with an insulated pad. This bag has performed perfectly at slightly warmer conditions. However, the last place you want to find out your bag is not warm enough is when you are out in the cold night and you can't sleep for shivering. Once the zipper got snagged and I couldn't get the bag closed, again on a cold night. I would have bought an REI -40º bag if they made one. I may have to take a serious look at the Marmot -40º bag
No, I do not recommend this product
J P
White Sands, NM
Good for cold desert nights
13 years ago
This bag is perfect for my needs. Camping without a tent in the Southwest U.S. desert gets cold at night and this bag is comfortable and packs up small (in comparison to similiar rated gear). That being said, I'm a thin, 5'4" stature and I fit perfectly in the regular bag. I doubt it would be comfortable for anyone taller than me. The coldest it's been during my use so far was just around freezing, so I can't speak to how it will do pushing -20. Finally the zipper does snag easily, so it requires being slow and carefull with zipping it up.
Yes , I recommend this product
IntoTheWild Thrane
Bozeman, Montana
Awesome down bag for winter backpacking
13 years ago
This is an awesome sleeping bag and is worth every penny. Thanks to the REI warranty policy I was not afaid of dropping 300 bucks to get this bag. I have used it many times mainly for winter backpacking trips. I remember one trip where I was camping out in a -10 degree blizzard with 50 mph winds thrashing my tent and was saved by my rei -20 expedition bag. I have heard that for whatever bag you get subtract 10 degrees and that is the degrees you will be warm up to. For example 0 degree would be 10 degrees, 32 bag would be 42 and my -20 is good up til -10. If you are planning on getting a top quality bag for serious winter backpacking, hunting, or just camping I would definitely get REI's -20 Expedition.
Yes , I recommend this product
jewells
Portland OR
spot on for me
15 years ago
I am 5"10 170 (average mountaineer size)and this bag is plenty spacious for me, it is also snug and comfortable. It appears to pack down and weigh the same as other more expensive bags in its category. Its a -20 bag so it is not going to pack down too small, I am surprised that some say its not big enough because I got room to spare. I have not had it down to -20 and I wouldn't take any sleeping bag of any brand to its rating limit. Good deal and a good sleeping bag.
Yes , I recommend this product
Kavonz1
Kalamazoo, MI
Toasty at 20,000ft
14 years ago
I bought this bag for an Aconcagua expedition up the normal route. The bag worked well from Confluencia (40F at night, 12,000ft) all the way to White Rocks (-30F at night, 20,000ft). The bag held up to the abuse of packing and unpacking during the 2 weeks trip. Regarding packing size, it's not the lightest bag but was manageable. I used a stuff sack and was able to compress the bag down to the size of a football. I typically sleep warm, so was a little concerned at the lower altitudes but the dual zips allow many different configurations. At altitude I was wearing my thermal pants and top and a wool hat and socks. Overall, the bag performed perfectly and I slept comfortably (as well as you can at altitude) the two weeks I was on the mountain.
Yes , I recommend this product
boober
colorado springs colorado
-20 below my Butt
13 years ago
I don't know where you get these temp. ratings from but upon just returning from a five day camping trip at 9100ft.on the front range of the springs.I went up 11/5/11 just as a cold front was passing thru the area; I finally had to answer mother natures call around 10 or so and checked the temp.from the thermometer on my pack it was 16 below I froze my butt off. I experienced cold spots as well; I did not have a good nite.the next four nite's it never went below 0:Thank GOD the winter here in the springs it has not even started to get cold.I do a good amount of winter camping and i don't like the idea of a bag not allowing me to go to the temp. extremes that I feel comfortable camping in.Also why did I have those cold spot's? that's not suppose to happen.
Yes , I recommend this product
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