When traveling or camping on nature, you need utmost preparation. Sleeping outside is different from room, even you build tend as cover. One of versatile stuff to assist sleeping in such situation is down sleeping bag liner. Some advantages of utilization this bag make travelers do not have to worry anymore. Bag length is body size with additional cover on top to protect head. Width is fit for your arm to move halfway. It might be not good for stretching arm but very comfortable cover. It is really bagged but very big to suit human body. This stuff is very suitable for camping.