US Military 4 Piece Modular Sleeping Bag Sleep System MSS w/G Bivy Woodland Camo – New. The 4-Part Modular Sleep System sleeping bags and components are indispensable when you are camping, hiking, or simply needing a high-quality sleep system, providing warmth from cool to extremely cold temperatures. These 4-pieces form a winning equation for comfort and protection-offering extreme comfort in extreme cold temperatures. Rated for temperatures down to -10°. Free from cold spots. Insulation does not migrate in the bag. Anatomically designed foot box contains twice the insulation as the bag. Sewn-in quilted chest collar prevents air drafts up and down through the hood. Hood adjusts for heat retention; includes nylon drawcord and barrel lock. Dimensions: 87.00″ x 35.50″. Camo Green Patrol Bag. Rated for temperatures down to +30°. Draft flap prevents heat loss. Non-locking slide fastener self-repairs if jammed or snagged. Reversible double-pull (opens end to end) slider allows top or bottom ventilation. Dimensions: 92.00″ x 37.00″. Woodland Camouflage Waterproof Bivy Cover. Made from waterproof, moisture-vapor-permeable material. Snap fastener and slide fastener closure. Dimensions: 85.00″ x 28.00″ x 35.00. 9-Strap Black Stuff Sack. Compressible to one cubic foot. Constructed of water-resistant materials. Nylon drawcord closure with a barrel lock. Six 1-wide nylon webbing straps adjusted by ladder lock buckles. Reinforcement webbing is sewn around the circumference of the bag. Dimensions: 30.00″ x 14.00″. All four pieces were manufactured in the USA and designed to work flawlessly with each other to provide warmth in temperatures ranging from 50ºF to -30ºF when the user is wearing layers of extremely cold weather clothing. If you spend much time outdoors in extreme cold, this high-performance sleep system will pay for itself repeatedly.