I bought this sleeping bag for a late summer boundaries waters trip. The bag kept me very warm in 30-40 degree nights. So warm I was sweating one night. It is very light and easy to pack! However, I give it 4 stars because it's a very tight fit when you sleep. I couldn't move my legs around or move in any other positions. I could only sleep in the pencil position. It would have been nice for more leg room but that's what you get. Otherwise awesome bag!