Military Modular 4 piece Woodland Sleep System. These systems are in New condition. Includes 2 Sleeping Bags with Woodland GORTEX Bivy Cover, and1 Large stuff sack. 4 pc Modular Sleep System. Made in the USA! Official USA Military Army Surplus. This package Includes ALL 4 pieces. 1 Large Compression Stuff Sack. Modular Sleeping Patrol Bag. Intermediate Cold Modular Sleeping Bag. When all 3 bags are combined inside each other and fastened together, the modular sleep system is rated to -40 degrees! These modular sleeping bags are mummy-style bags and include the OD Green Patrol Bag, Black Intermediate Sleeping Bag, Woodland Camo Gore-tex Bivy Cover, and 1 Large (Black) Nylon Compression Stuff Sack. Bags can be used separately for warmer weather conditions or joined together for colder weather conditions.