Authentic Military-Grade Modular Sleeping System. Designed as a perfect replica of the U. MT Military Army Modular Sleeping Bag System(4-Piece) Assembly Includes Patrol Sleeping Bag, Intermediate Sleeping Bag, Bivy Cover and Stuff Sack. A variety of combinations to meet the survival environment from 30 degrees above zero to 40 degrees below zero. It is made of Water-resistant and scratch-resistant high-strength nylon surface, thickened nylon tightening belt. Filling: Polarauard HV High-grade military filling material, high fluffy, compression resistant. Adaptable for All Environments & Seasons – Use the sleeping bags individually or combine them to adjust for various temperatures and conditions, making it an ideal choice for camping, hiking, and survival. Durable & Waterproof Protection – The bivy sack is made of breathable, waterproof nylon fabric, ensuring protection against wind, rain, and moisture while maintaining comfort. Ultralight & Compact Design – The entire system is lightweight and easily packable with the compression sack, making it perfect for tactical, outdoor, and emergency preparedness. Trusted by Outdoor Enthusiasts & Survivalists – Whether for military use, survival gear, or extreme expeditions, this modular sleep system ensures warmth, adaptability, and maximum durability in demanding conditions. MT Military Modular Sleeping System. MT military modular sleeping bag system =summer thin sleeping bag jacket +spring autumn sleeping bag+ winter low temperature sleeping bag + winter or high mountain sleeping bag. It can be used in conjunction with each other or separately. The large Stuff Sack is made of waterproof Nylon and it can hold both the Patrol sleeping bag and the Intermediate cold weather sleeping bag as well as the Bivy Cover.