US Military 4-PC Weather Resistant Modular Sleep System with Waterproof Gore-Tex Cover by TENNIER INDUSTRIES. Product Description: This is a genuine U.S. Army Modular Sleeping system which is one of the best found anywhere in the world and it's rated to up to -50 degrees!! This Modular Sleeping System is constructed to insulate the user in environments ranging from mild weather to extremely cold weather. It includes 4 parts: a khaki patrol bag, the dark olive intermediate cold weather bag, a digital camo bivy cover, and a dark olive stuff sack. The two mummy style sleeping bags can be used independently or together in colder environments. The patrol bag is rated at +30 degrees, the intermediate cold weather bag is rated to -10 degrees and both bags can be used with the vapor permeable bivy cover. When all three components are used together they are rated from -30 to -50 degrees. Perfect for spring/summer camping in any climate. Rolled and stuffed into the carry bag, the entire set is about the size of a bag of groceries. Last but not least, beautifully designed and constructed. Includes: 1 Patrol "Warm weather" Sleeping Bag. + Intermediate Cold Weather Sleeping Bag. + Gore-Tex Bivy Cover. + Stuff Sack. Excellent pre-owned/never used condition. From smoke free/pet free home. Sells for $650 new from manufacturer.