This will be the second western mountaineering bag I own. I also have the summer lite for ultralight lightweight trips. The Terralite is much roomier and very warm. When unzipped like a quilt you can easily fit two under the bag and sleep comfortably. Highly recommend for weight, size, and warmth. I've had this bag in the 20's and no layers and stayed very warm.
This review was written in the old system and had content requirements that are different than reviews written today.