The 4- Part Modular Sleep System. Camo Green Patrol Bag. Woodland Camouflage Waterproof Bivy Cover. The uses for this four piece system are many. With the ability to use the cover with each individual piece, the ability to separate the bags from each other and use them independently is essential for personnel assigned to field work for long periods at a time. The range of uses, compact design, and lightweight materials make this system a must for any adventurist who needs to be able to mobilize quickly. Military personnel and non-military outdoor adventurists will both benefit and enjoy their outdoor experience while staying dry and warm when they use the Military Modular Sleep System 4 Piece with Gore-Tex Bivy Cover and Carry Sack. The item “4 Piece Modular Sleep System USGI MSS Military Made in USA by Tennier 40 to -50″ is in sale since Thursday, November 10, 2016. This item is in the category “Sporting Goods\Outdoor Sports\Camping & Hiking\Outdoor Sleeping Gear\Sleeping Bags”. The seller is “dudleydealinggovsurplus” and is located in Houston, Missouri. This item can be shipped to United States.