Thermarest ProLite Sleeping Pad is every campers necessity. Don't get too excited about the comfort, but think more along the lines of heat retention. Whether you are in your tent, out in the open, or chilling in your Kammok Roo, this sleeping pad will keep you warm. It is "self inflating" and I have yet to figure out what that means, as I mySELF inflate it with my lungs every time. Not sure why that is on of Thermarest's selling points. The ProLite comes in four different sizes ranging from a length of 36" to 72" to accommodate your packing needs.
I use this pad even when I am couch surfing as it keeps me from having that weird lower back pain after sleeping on any said couch.