A sleeping bag is a portable bedding item designed for warmth and comfort during outdoor activities like camping or hiking. It is typically made of insulated materials and features a zipper for easy access. Sleeping bags come in various shapes, sizes, and temperature ratings to suit different environments and personal preferences. Most sleeping bags are designed to be lightweight and compact, making them easy to carry in a backpack. They can be used in tents or under the open sky, providing a cozy space for rest. Some sleeping bags also have additional features, such as hoods or pockets, for added convenience.