Military Modular Sleep System 4 Piece with Goretex Bivy Cover and Carry Sack Go to amazon.com Related posts Which are the best bivy cover goretex available in 2019? Top bivy sack goretex for 2020 FeatureNewVery Good to Excellent Used Condition DescriptionThis is the best sleeping bag that the US Military has ever produced. Complete set includes the OD Green Patrol Sleeping Bag, Black Intermediate Sleeping Bag, Gore-Tex Woodland Bivy Cover and Black Compression Sack.