Just bought a bag today at a goodwill for $5. It looks to be about 5 feet long. I think it was childs bag b/c it has a compartment in the back for a air mat, there's a hole at the top where the valve used to be. I think I'm gonna get some quilt batting topu inside for insulation then add loops to the ends to hang it. I'm a pretty warm sleeper and I don't plan on camping out in 20 degree weather