A backpack, often referred to simply as a "pack" or "rucksack," is a type of bag that is carried on one's back with two straps over the shoulders. It's a versatile and practical accessory used for carrying personal belongings, such as books, laptops, clothing, and other essentials.

Backpacks are designed with multiple compartments, pockets, and zippers to help organize and secure items efficiently. They come in various sizes, from small daypacks suitable for short trips or everyday use to larger backpacking packs ideal for hiking, camping, or traveling.

Modern backpacks are often made from durable materials like nylon, polyester, canvas, or leather, offering both strength and water resistance. They typically feature padded shoulder straps and a padded back panel for comfort during extended wear. Some backpacks also include additional features such as chest and waist straps for added support, hydration bladder compatibility, and external attachment points for gear like trekking poles or water bottles.

With their practical design and ergonomic features, backpacks are popular among students, commuters, travelers, outdoor enthusiasts, and professionals alike. They provide a convenient hands-free way to carry belongings while distributing weight evenly across the body, making them comfortable and functional for various activities and lifestyles.