I've taken this bag on a few back country trips and it has performed pretty much as expected for a lower end bag. I spent a week in British Colombia in early July near Whistler and did not get cold at night with temps in the low 40s. In fact, a few nights I got a little toasty. I also used it in September camping in Mammoth area where temps were near 30 degrees at night at 10,000 ft. Sleeping with a long sleeve and socks, I was able to maintain and sleep through most the night, however it did not come without mild discomfort. Nothing really special about this pack, but I continue to use it because it packs down to a good size to fit in my pack and if something happens to it it didn't cost me much. My biggest complaint is the zipper, and if you gotta pee in the middle of the night it gets frustrating trying to get out of the bag half asleep. With a little jiggling, it works but takes a bit of getting used to. Got it off SAC for a great price. Here's a pic of me sleeping on a park bench in Whistler... needless to say a long night, but the bag was good!