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Last updated January 1st, 2020
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The Western Mountaineering UltraLite 20 Degree Sleeping Bag is a compressible sleeping bag for moving through various climates during summer bike tours and hiking trips. Sleep in it. Or on it. Who cares, when you're in a different camp each night, this lofty fellow will be by your side. When the temps are low, zip up and tuck into the hood, you'll be toasty warm thanks to the full down collar and draft tube. When you're not off in dreamland, it compresses down into a 7"x13" stuff sack, taking up less space in your saddlebags or backpack and only weighing 1lb 13oz. Wowza!
The Western Mountaineering UltraLite 20 Degree Sleeping Bag is a compressible sleeping bag for moving through various climates during summer bike tours and hiking trips. Sleep in it. Or on it. Who cares, when you're in a different camp each night, this lofty fellow will be by your side. When the temps are low, zip up and tuck into the hood, you'll be toasty warm thanks to the full down collar and draft tube. When you're not off in dreamland, it compresses down into a 7"x13" stuff sack, taking up less space in your saddlebags or backpack and only weighing 1lb 13oz. Wowza!
FEATURES of the Western Mountaineering UltraLite 20 Degree Sleeping Bag
Interlocking draft tubes and a full down collar that wraps snugly around your neck to help seal in heat
Breathable, water resistant shell protects you (and the down) from condensation
5 1/4" spacing of continuous baffles that encircle the bag from zipper to zipper
16 oz of 850 fill is highly compressible, light weight and toasty warm
5" of loft, rated at 20° F
Full-length #5 YKK zipper
59/38" Shoulder/Foot Girth
1 lb 13 oz Total Weight
Product Specifications
Gender:
Mens
Features:
Ultralight
Best Use:
Ultralight Backpacking, Mountaineering and Alpine
Exact Temperature Rating:
20 Degrees Fahrenheit
Sleeping Bag Shape:
Mummy
Bag Weight (Short):
1 lb 12 oz
Bag Weight (Regular):
1 lb 13 oz
Bag Weight (Long):
1 lb 15 oz
Fill Details:
850+ Fill Down
Zipper Side:
Right
Fill Weight (Short):
15 oz
Fill Weight (Regular):
16 oz
Fill Weight (Long):
17 oz
Max User Height (Short):
5 ft 6 in.
Max User Height (Regular):
6 Feet
Max User Height (Long):
6 ft 6 in.
Foot Circumference (Short):
38 in.
Hip Circumference (Regular):
51 in.
Shoulder Circumference (Long):
59 in.
Ultralight:
Yes
Disclaimer:
We only ship this brand to US Addresses.
Insulation:
Down
Temperature Rating:
11 - 20 Degrees Fahrenheit
Product Reviews
Rated 5 out of
5 by
Sakuragi from
Best Sleeping Bag for MountainI uesd the Sleeping Bag on Taiwan Nanhu Dashan and the weather was 32°F. I feeled so warm and slept well by using this sleeping bag.I buy the second one for my family.
Date published: 2022-12-20
Rated 5 out of
5 by
Ozark Mike from
Quality ProductThis sleeping bag has exceeded my expectations! Extremely well made and will keep me warm for many camping trips to come. Id highly recommend this item and brand of you are looking for product that can last a lifetime
Date published: 2022-11-21
Rated 5 out of
5 by
Swampdog from
The Gold StandardThis is the second Western Mountaineering Ultralite in our household, my wife bought this one to match the bag I've been using and sharing with her for five years.
There's not much left to say about this bag that's not already been heavily written about in the established canon of lightweight backpacking.
Yeah, a quilt would be lighter. But I personally thrash around a lot when I sleep, and have never had a quilt stay on me for an hour, much les a whole night. The 6'6 bag in the supplied stuff sack weighs 884 grams, just barely under 2 lbs. If you have been using cheaper bags, you will be surprised how honest or even modest the 20 degree rating is. I've spent many comfortable nights in this bag in conditions below the 20 degree rating. If it's above freezing and you really like your backpacking partner, two people can use one of these unzipped bags as a quilt.
The zipped-up fit of this bag is very tight, to keep the bag lightweight and to keep you warm. I'm 6'3 200 lbs. There's plenty of width in the bag for broad shoulders, but I wish they made a longer length than 6'6. If you're over six feet tall and have big jackrabbit feet, you'll likely feel the same. The 6'6 bag is a lot more appropriately sized to my 5'10 wife than to me.
Durability is excellent given the weight. I've spent about 100 nights in this bag, and am not particularly careful around it. I poked some holes in the shell the first year I owned this bag by carelessly throwing a bunch of sharp avalanche gear on my bed after a long day at work. I used some small pieces of generic self-adhesive gear repair tape to fix the holes I made in the bag, and they haven't frayed or expanded at all in the past four years. Functionally the durability of this bag is about the same as the 15lb military surplus ECWS bag I use for car camping.
Date published: 2022-06-21
Rated 5 out of
5 by
Ciscokid970 from
Best bag I’ve ever ownedHaven’t had a chance to test the temp rating yet, but initial impression is excellent. Very well built, extremely light, very lofty, very warm. I’m really glad I finally pulled the trigger on it. I’ve always wanted one of these bags. It lives up to the reputation and is worth the price tag. Blows everything else I’ve had out of the water.
Date published: 2022-05-25
Rated 5 out of
5 by
hikerboy from
Simply the bestThis is the 2nd WM bag I've bought and I am convinced no one makes a better quality down.sleeping bag.The attention to detail is outstanding, and every bag is personally signed by the sewer who put it together.One great improvement from my previous bag was a firm strip of fabric along the zipper so that the zipper doesn't get caught in the fabric itself.
Date published: 2022-03-21
Rated 5 out of
5 by
Ulysses from
Excellent Sleeping BagThe finest sleeping bag I've ever owned. Very well made, very light, very lofty. The stiff strip of material behind the zipper promises fewer zipper snags, a nice feature.
Date published: 2021-12-01
Rated 5 out of
5 by
TomCNY from
Expect and receive the best.I bought this sleeping bag based on our long experience with our 40D WM bags. Although we normally are in hammocks (and use quilts), we have started using a tent in the late fall / early spring and on bicycle trips.I am 5' even and this bag is just big enough to allow me to stuff some clothes in the bottom and button up the hood easily. It has easily handled the lower 20's and with some additional layering of clothing, I am sure it could be used in the mid-teens. The quality is what you get with WM equipment and if you take care of it, lasts a long-long time. To top it off dealing with Moosejaw is a breeze.
Date published: 2021-11-16
Rated 4 out of
5 by
Lcw341 from
Lightweight, compact. Not for coldest nightsI have used this bag a couple of times so far and am impressed with the warmth to weight ratio. It packs down well with a good compression sack. Most of my backpacking is in Colorado and the nights can get pretty cold (low 30s is common)…I found this bag took a long time to warm up on colder nights. Choose a lower temp rated bag if you’re going to be in cold temps.
Would this be to warm for Summer months? Also how small can this bag compress down too?
Asked by: Amber
Too* warm
Answered by: John
Date published: 2022-11-08
I'm 5'6 with wider hips. Will the short work or would it be better to go with the 6'0?
Asked by: Traveller108
Hiya, thanks for your question! I'm 5'6" and I have a short Western Mountaineering SummerLite bag. It fits fine for me but I wish there was a little more height to store some clothes at the bottom while I'm in it. Your hips... I hear they don't lie ;)... should fit in either size, so it just depends on if you prefer a little more length. Hope this helps!
Answered by: Alice in Wanderland
Date published: 2020-10-19
Hi, I'm 5,91 ft height which size fits me better regular or long? Regards, Hugo C.
Asked by: hugocaesar
Hey there Hugo, you would want to pick up the Regular length for this item. Regular fits folks up to 6' tall. The Short size fits those up to 5'6" and the Long length fits people up to 6'6". With a sleeping bag, you want to choose one that is long enough to fit you but not TOO long, so you would definitely want to go with Regular and not Long.
Answered by: Rocko Gigsby
Date published: 2016-05-11
Hello, does this bag have DWR or any type of water resistance?
Asked by: Vidrio21
Hiya, thanks for your question! This bag is has a breathable, water resistant shell. It can lose it's effectiveness with use but the outer shell fabric can be re-treated to restore water resistance. Hope this helps!
Answered by: Rocko Gigsby
Date published: 2016-09-27
How does this bag compare to the Terralite 25- they seem really similar and I think may weigh the same? I'm looking to drop a few ounces by upgrading from my Marmot Meteor Penguin 15- which is comfy, but more than I often need & weighs about 2lb 7.
Asked by: Terry
Hey Terry,
The weights of these bags are very similar. The regular length of the UltraLite 20 is about 1 lb 13 oz
and the average weight of the Terralite 25 is 1 lb 8 oz or a claimed weight of 1 lb 13 oz. Besides the temperature ratings these are very similar bags, both designed for 3 season use.
Answered by: Rocko Gigsby
Date published: 2015-09-01
How does the ultralights comfort level for side and stomach sleepers compare to the nemo spoon series?
Asked by: Kyle
Hey there, Kyle!
Great question. As you probably know, there are some key distinctions in features between these types of bags, including extra warmth with the Western Mountaineering bag.
Just based on the mummy shape of this UltraLight, the Nemo spoon series will give you a little more room for spreading out or sleeping on your side.
I hope this helps!
Answered by: Buttercup
Date published: 2018-07-06
Would this hold up well for a thru hike?
Asked by: Surf_erk
Hiya, thanks for your question! Western Mountaineering sleeping bags are unparalleled in construction and quality, which makes this bag is an excellent choice for a long journey. It is lightweight, yet still warm. Hope this helps!
Answered by: Rocko Gigsby
Date published: 2020-09-23
Does 5'6'' fits well for a 5'5'' person? will it feel tight?
Asked by: brad
Hey there,
Thanks for reaching out to us! The Western Mountaineering UltraLite 20 Degree Sleeping Bag 5 ft 6 in should fit you considering your 5 ft 5 in. I'm not sure how you sleep, but it is a mummy-style bag which can sometimes feel a bit constrictive. Sleeping bags keep you warm by trapping your body heat, so you don't want too much extra space. Also, extra space equals more weight in your pack. If you're still undecided, there's the 6 ft bag. I hope this has helped!
