Definition: A backpack is a type of carrying bag that is typically used to carry a person's essentials, such as books, electronics, and other items. It often has compartments for storing small items like pencils, notebooks, and chargers, as well as a handle or shoulder strap to carry the bag over long distances. Backpacks are commonly found in various sizes and materials, including nylon, polyester, and synthetic fabrics, depending on their design and intended use.