A backpack is a versatile and practical bag designed to be carried on the back, supported by two shoulder straps. It is commonly used by students, travelers, and hikers to carry books, supplies, clothing, or gear. Backpacks come in various sizes, materials, and styles to suit different needs. Many modern backpacks also feature multiple compartments, padded straps for comfort, and additional features like laptop sleeves, water bottle holders, and weather-resistant fabrics. Whether for school, work, or outdoor adventures, a backpack provides a convenient way to carry essentials while keeping hands free.