Backpacks are used by people in many professions and activities to carry their goods and equipment. Students use backpacks to carry books, hikers use them to transport tents, tools and extra items from place to place, and military officers rely on backpacks to carry equipment and ammunition. Backpacks come in various sizes and styles designed for specific uses like carrying kids' toys, computer accessories, or military gear. With changing lifestyles, backpacks have evolved from purely functional carriers into fashionable accessories available in many modernized shapes for men, women, children, and professionals across indoor and outdoor activities.