USGI 4-Piece Modular Sleep System. This 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. The OD Green Patrol Sleeping Bag (inner bag) is rated for temperatures down to 30 degrees when used by itself. The bag is constructed of ripstop nylon Polarguard HV resin polyester fill and is water resistant. It has a reversible double pull slider which allows the top or bottom to ventilate and a draft flap to prevent heat loss. The black Intermediate Sleeping Bag (outer bag) is rated for temperatures down to -10 degrees. This bag is also made of ripstop nylon Polarguard and has double insulation in the foot box to ensure you stay warm. The Bivy Cover is made of genuine GORE-TEX fabric with sealed seams so it is waterproof / windproof and will keep you dry in the worst weather. The compression stuff sack is black nylon with size 1” web straps with adjustment buckles. Overall very good used condition. Learn More