A backpack is a versatile and practical bag designed to be carried on the back, supported by two shoulder straps. Typically made from durable materials like nylon, canvas, or polyester, it features multiple compartments and pockets that help organize items efficiently. Backpacks are commonly used by students, travelers, hikers, and professionals for carrying books, laptops, clothes, and other essentials. They offer hands-free convenience and even weight distribution, making them comfortable for long-term use. With a variety of sizes, colors, and styles available, backpacks are both functional and fashionable, catering to different needs and preferences.