Western Mountaineering UltraLite Sleeping Bag

-7°C Comfort Limit, 455g of 850+ Fill Power Down (US Method)
Weighs 820g (Regular bag)
Code: OC1391V
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If your summer bike tour is going to take you through different climates then the UltraLite is a good choice. With a 59` shoulder girth this efficient bag is good to -7°C. The full down collar helps to seal in heat around your neck without adding excess bulk and 455g of high lofting down pumps this bag to 5". The total weight of this very compressible package is only 820g.

Western Mountaineering down gear has an awesome reputation in the US and that reputation is beginning to build on this side of the pond. Very high quality materials design and construction results in the lightest bags available for a given warmth.  

An example of their attention to detail is their quoted 850+ fill power down used in all their bags: WM quote this figure even though their down generally gets higher ratings in official tests this is because they feel that the official pre-testing preparation enhances the down quality!

Read reviews here:            
Help and advice: Choosing a sleeping bag advice EN 13537 rating for sleeping bags explained All about down filling in sleeping bags
Sleeping bag shape and sizes advice Sleeping Bag features Page 1 Sleepin bag features page 2
  • Continuous Baffle Construction
  • Full Down Collar
  • Extremelite Shell
  • Shape: Mummy (box stitched)
  • Rating: 2°C / 35° F *
  • Loft: 9cm / 3.5"
  • Highest Quality minimum 850+ fill power down


  • Length: 165cm / 5'6"
  • Weight: 768g
  • Fill weight: 425g
  • Packed size: 33 x 18cm
  • Internal shoulder girth: 150m / 59"
  • Internal hip girth: 130cm / 51"
  • Internal foot girth: 97cm / 38"
  • Full Length Baffled YKK Zipper


  • Length: 180cm / 6"
  • Weight: 838g
  • Fill weight: 455g
  • Packed size: 33 x 18cm
  • Internal shoulder girth: 150m / 59"
  • Internal hip girth: 130cm / 51"
  • Internal foot girth: 97cm / 38"
  • Full Length Baffled YKK Zipper


  • Length: 200cm / 6'6"
  • Weight: 902g
  • Fill weight: 480g
  • Packed size: 33 x 18cm
  • Internal shoulder girth: 152m / 60"
  • Internal hip girth: 132cm / 52"
  • Internal foot girth: 97cm / 38"

* Western Mountaineering state: 'We independently verify own temperature ratings through our own testing, customer feedback and design knowledge. Most of the items in our catalog we have been making for years, which means we have lots of prior knowledge from everyday consumers on what ratings are accurate. We have also EN tested our bags. In every case the EN rating is lower than our posted rating. This means our ratings are more conservative. We do this to ensure that almost everyone will be happy in our bags at the temperature we publish.'

Showing our 1 review for Western Mountaineering UltraLite Sleeping Bag. Write a review ›
Review Summary - 5 out of 5 based on 1 rating.
July 26, 2019 | Simon Miles
Excellent down sleeping bag

I've used plenty of down sleeping bags over the years and the Western Mountaineering bags are up there with the very best of them. Materials and construction, as you would expect at this price point, are first rate. But what really sets these bags apart is the quality of the down, which provides exceptional loft and phenomenal insulation for the size/weight of the bag. And if, like me, you're not six foot tall, you'll really appreciate being able to buy a bag that's the right length for a change. Not cheap, but you get what you pay for. Highly recommended.

Ultralight Outdoor Gear Limited