Western Mountaineering UltraLite Sleeping Bag: 20 Degree Down

We’ve read the reviews across the web for the Western Mountaineering UltraLite Sleeping Bag: 20 Degree Down and summarize the results below:

Universal Ranking

PeakScore: 90 (out of 100)
User Rating: 4.6 stars 
Expert Rating: 4.3 stars

Number of Ratings Reviewed: 89

Pros & Cons

Reasons to buy:

User Reviews

  • Very lightweight and compressible.
  • One of the highest quality sleeping bag brands you can buy.
  • Soft and fluffy down that is responsibly sourced.
  • Very warm for a 20-degree rating bag.
  • Cinches keep heat in around the collar and hood.
  • Best zipper on the market – never catches or snags.
  • Durable and long-lasting.

Expert Reviews

  • This 850+ quality down bag is great for 3-season use.
  • An optimal combination of warmth, lightweight material, and packable down.
  • The shell fabrics are softer than much of the competition.
  • The horizontal baffles allow the heat to stay in, and allows the down to be moved around to customize the warm spots.
  • Offered in 3 sizes.
  • The mummy shape hugs your body for warmth retention.
  • Standard DWR-treatment aids in shedding light moisture.
  • More than half the weight of the bag is comprised of down, making it very warm-for-the-weight.
  • The draft tube design protects the zipper from snagging and catching on the material.
  • Oversized neck baffles to keep heat in around the neck.

Reasons NOT to buy:

User Reviews

  • May not be suited for those with broad shoulders.

Expert Reviews

  • The shell is thinner than some of the competition.
  • Narrow dimensions which may not suit all body types.
  • Slightly larger pack size than the competition.
  • No organizational pocket.


The Western Mountaineering UltraLite Sleeping Bag: 20 Degree Down is a great choice for backcountry travelers who want a durable, lightweight, and comfortable 3-season bag. The feather-weight of the bag coupled with the high warmth-to-weight ratio will keep you warm and cozy on your adventures.


Note: User and expert rankings were reviewed across the web, including here: 1, 2, 3, 4, 5, 6, 7.