A backpack is a versatile and practical bag designed to be carried on the back using two shoulder straps. It typically has multiple compartments for organizing items like books, clothes, gadgets, and personal essentials. Commonly used by students, travelers, hikers, and professionals, backpacks offer comfort and convenience by evenly distributing weight across the shoulders. Made from durable materials such as nylon, canvas, or leather, they come in various sizes and styles to suit different purposes and preferences.