A rucksack, also known as a backpack, is a type of bag that is worn on the back, supported by shoulder straps, and used to carry personal belongings. Rucksack bags are versatile and commonly used for various activities such as hiking, traveling, commuting, and school.

Rucksack bags come in different sizes and capacities to accommodate varying needs. They are usually measured in liters and can range from small daypacks (around 20-30 liters) to larger backpacks (40+ liters) for extended trips or carrying more gear.