The Patrol Sleeping Bag, Genuine Military Issue, is part of the militaryâ??s Modular Sleep System, which incorporates multiple bags of differing temperature ratings, nested into one another. This allows for versatility in meeting different temperature ranges and personal sleep preference. Rated for 30-50 degree F, the Patrol Sleeping Bag, by itself, is a lightweight and versatile bag for 2 season use. At just over 2lbs, you can carry this just about anywhere.