The Modular Sleep System (MSS) is a modular sleeping bag used by the United States armed forces. The MSS consists of 4 individual pieces of military field gear. A camouflaged, waterproof, breathable Gore-Tex bivy cover. A lightweight patrol sleeping bag. An intermediate cold weather sleeping bag. Compression sack is included to store and carry the system. The patrol bag provides cold weather protection from 35 to 50 degrees Fahrenheit. The intermediate bag provides cold weather protection from minus 5 to 35 degrees Fahrenheit. Together, the patrol bag and intermediate bags provide extreme cold weather protection in temperatures as low as minus 30 degrees Fahrenheit. The bivy cover can be used with each configuration (patrol, intermediate, or combined) to be comparable with the environment in which the system is being used; the bivy cover provides environmental protection from wind and water. Sleeping bags are made of ripstop nylon fabrics and continuous filament. Polyester insulation; camouflage bivy cover is made with waterproof, breathable, coated or laminated nylon fabric called Gore-Tex; the compression sack is made with water-resistant, durable nylon fabric. The item “NEW! 4-PIECE, MODULAR SLEEP SYSTEM, WOODLAND CAMOUFLAGE (With BIVY COVER) USMC” is in sale since Monday, December 17, 2018. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Personal, Field Gear\Other Current Field Gear”. The seller is “sugarmagnoliasocal” and is located in Asheville, North Carolina. This item can be shipped to United States.