or those that use a 20 degree mummy bag, do you find it adequate enough for the broad range of sept weather. I currently use a 0 degree bag that my wife has had before we met. I found that I need to sleep in my undies or I get too hot and wake up numerous times a night. and it got into the teens at night several mornings. it is a 6 ft bag and I am needing a 6\'6 bag to be comfortable. warmth wise its great. but if I can get away with a 20 degree bag and bag liner, I will go for that. as long as it works....