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.
Summary:
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.