This 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.
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