The MSS sleeping bags and other components are constructed to be used in conjunction with each other, or separately to complete an interoperable system known as the extreme cold weather sleeping bag.

The MSS is designed to provide comfort in temperatures ranging from 50°F to -50°F when wearing various layers of extreme cold weather clothing.

The Water proof Bivy Cover is produced utilizing waterproof, moisture-vapor-permeable material with all seams heat sealed. The Compression Stuff Sack is constructed with water resistant materials with adequate volume for both bags as well as the Bivy cover. This unique sack compresses the system to one cubit foot.


The 4- Part Modular Sleep System -NSN # 8465-01-445-6274 includes:

  • Camo Green Patrol Bag
  • Black Intermediate Bag
  • Woodland Camouflage Waterproof Bivy Cover
  • Black Stuff Sack

Individual parts

  • Camo Green Patrol Bag- NSN # 8465-01-398-0685, X-long NSN # 8465-01-452-1688
  • Black Intermediate Bag-NSN # 8465-01-398-0687, X-Long NSN # 8465-01-452-1690
  • Woodland Camouflage Waterproof Bivy Cover-NSN # 8465-01-416-8517, X-Long NSN # 8465-01-452-1695
  • Black Stuff Sack-NSN # 8465-01-398-5428