This is not a 20 degree bag. I went camping and in 32 degrees inside of a tent, I was freezing. Also this bag leaks down. The quality is poor. Don't buy.
I work professionally in the backcountry and have used many top brand sleeping bags over 19 years. I've had my eye on this one for a decade and with free shipping and a sale I decided to give it a try. This rectangular bag stands up to high end bags in terms of quality but is even better because it's roomier and still light weight.
I just returned from a river rafting trip with this bag. It was a little warm for the occasion, but I just unzipped it and spread it over me. It is really comfortable with the rectangular shape. I don't like being confined in a mummy style bag. Very light and compact as well as far as packing goes. The bottom felt a bit thin, but I think this is a very versatile bag. Can be made warmer with a liner or cooler by unzipping. Very comfy!! I like it a lot!