US military issue patrol sleeping bags! These are the lightweight bag in the modular sleep system, when used alone they are good down to around 30-35 degree. You can use it alone, with a poncho liner or wool blanket inside, or with the Gore-Tex Bivy cover we sell for increased warmth and to make it waterproof.
Made of ripstop nylon that is water resistant, with a drawstring adjustable hood. Nice and roomy, these are a great spring-summer-fall sleeping bag! And they can pack down really small and are very light for all the warmth they provide.