2026 NEW 4 Piece Modular Sleep System (MSS)

These 4-pieces form a winning comfort equation–offering Extreme Comfort in Extreme Cold temperatures. This system is used in good condition.The 4-Part Modular Sleep System sleeping bags and components are indispensable when you are camping, hiking, or simply in need of a high-quality sleep system offering incredible warmth in cool to extreme cold temperatures. 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 extreme cold weather clothing. If you spend a lot of time outdoors in extreme cold, this high-performance sleep system will pay for itself over and over again.

• Temperatures 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