A sleeping bag is a protective bag for a person to sleep in, particularly when camping. It is usually a piece of equipment for outdoor enthusiasts, such as hikers, backpackers, and campers, who need a portable and lightweight place to sleep when they are away from home. Sleeping bags are designed to keep you warm in cold weather and are made from a variety of materials, including synthetic fibers, down, and other insulating materials. They come in different shapes and sizes to accommodate different body types and preferences. Some sleeping bags are designed to be used in extreme cold weather, while others are intended for use in milder conditions.