Durable Polyethylene Construction: Crafted from durable Polyethylene, the MODERN NEEDS Emergency Sleeping Bag ensures long-lasting performance and reliability in any survival situation. Multi-functional Design: This camping sleeping bag can double as a bivy sack, offering 360-degree protection and additional shelter when needed. It also acts as a liner for standard portable sleeping bags, enhancing their thermal efficiency. Compact and Lightweight: Smaller than a soda can and weighing less than a deck of cards, this thermal compact sleeping bag is incredibly easy to carry. It unfolds to a spacious 7 feet long x 3 feet wide, fitting most individuals comfortably. Wind and Waterproof: Designed to keep you warm and dry, this emergency blanket is totally waterproof and windproof, ensuring you stay protected in all weather conditions. High Heat Retention: Made from materials used to insulate spacesuits, this military sleeping bag traps and reflects over 90% of your body heat, keeping you warm and cozy in extreme cold temperatures.