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Western Mountaineering UltraLite 20 Degree Sleeping Bag

Western Mountaineering UltraLite 20 Degree Sleeping Bag is rated 4.8 out of 5 by 33.
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4.8 Star Rating
4.8
$485.00 - $515.00

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Product Description Item No.   10079729

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
Weight: 29 oz
Exact Temperature Rating: 20 Degrees Fahrenheit
Sleeping Bag Shape: Mummy
Fabric Details: Microfiber
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
Rated 5 out of 5 by from Fantastic Bag I’ve used this bag for about a month on the PCT. It is excellent. Have stayed warm every night. Before I left for the trail I tested it to 23 degrees and I was comfortable all night. Highly recommend this product.
Date published: 2018-05-07
Rated 5 out of 5 by from Great Quality, very warm, very light Bought this about four months ago and have used it many times backpacking through Northern Arizona and Utah. The quality is very good and so far I have not seen any down pushing through. As it is stated it packs down very small, about the size of two 32oz hydroflasks with the provided stuff sack, it could be smaller in a compression sack although. This bag has kept me comfortably warm in weather from 40-15 degrees.
Date published: 2018-03-13
Rated 5 out of 5 by from Best Sleeping bag This is the best sleeping bag on the market! I was super surprised of how light it was but also how compact it could get! It is made of an amazing fabric that feels comfortable and I would never doubt the 20 degree rating. The only thing that I didn’t like is the price, but sometimes if you want quality gear that will last you a long time, is made of the best materials, and exceeds your expectations then you’ll have to pay a bit more. 10/10 would recommend
Date published: 2018-03-07
Rated 5 out of 5 by from Extremely lightweight and warm I bought the sleeping bag for a upcoming thru hike, based on other customers positive reviews. I was not disappointed! The bag is extremely lightweight and warm. Although a little pricey, the bag is very highly rated on most online review sites. When fully compressed, the bag is smaller than the shape of a football. If you are considering an ultralight bag, and can justify spending the $$$, I highly recommend the Western Mountaineering UltraLite 20 Degree mummy bag.
Date published: 2018-02-10
Rated 5 out of 5 by from Outrageously good I am a real gear nerd - disproportionate to how much I use the gear I buy! I wanted a really great sleeping bag. I read all the reviews, all the specs, I tried dozens out in REI. I am 6'3 and 165lbs. Western Mountaineering are the best sleeping bag manufacturers. This bag is insanely well constructed, made in america, by a fairly small enterprising company. I highly recommend it if you want a lightweight and comfortable sleeping bag. It compresses down into a tiny size. My only concern with this bag is that it might be TOO good/warm. Camping in the rain in Santa Cruz in October and I had to leave this bag open else I was too hot - a good sign! I got the long length and have acres of space to leave water filters and gas tanks and my dog in it with me.
Date published: 2016-11-12
Rated 5 out of 5 by from So light! Unbelievable how light this thing is without sacrificing any warmth! Just do it! Your back will thank you on the trail.
Date published: 2016-03-05
Rated 5 out of 5 by from Great Comport In my experience, I never expect this much good product.
Date published: 2016-02-29
Rated 5 out of 5 by from Awesome bag! I got this bag for an upcoming thru hike. I've used it now several times and I can't be more pleased with it. There's a reason why Wester Mountaineering is the leader in quality sleeping bags!
Date published: 2016-02-26
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Would this be to warm for Summer months? Also how small can this bag compress down too?

Asked by: Amber
Hiya Amber, thanks for your question! It depends how you sleep. I have the Western Mountaineering SummerLite 32 Degree Sleeping Bag, and it is toasty warm. If you planning to use it year-round, you might want to invest in the warmer bag but if you are just using it during warm months, you could get away with a lighter bag. Hope this helps!
Answered by: Alice in Wanderland
Date published: 2017-06-15

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: 2017-11-17

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: 2016-09-30

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!
Answered by: Rocko Gigsby
Date published: 2016-12-09
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- + Size Guide

Western Mountaineering UltraLite 20 Degree Sleeping Bag

SIZE / MAX USER HEIGHT 5' 6" 6' 0" 6' 6"
Shoulder Girth 59" 59" 60"
Hip Girth 51" 51" 52"
Foot Girth 38" 38" 38"
Fill Weight 15 oz 16 oz 17 oz
Total Weight 1 lbs 12 oz 1 lbs 13 oz 1 lbs 15 oz
Stuffed Size 7 x 13" 7 x 13" 7 x 13"
Loft 5.5" 5.5" 5.5"
Sac Size XS XS XS
Shape Mummy (w/ full collar) Mummy (w/ full collar) Mummy (w/ full collar)