Rucksack (noun)

1. A large backpack, typically made of canvas or nylon, used for carrying camping equipment, books, or other items on the back.
2. A backpack made of canvas or nylon that is worn on the back and used for carrying camping equipment, books, or other items.

Origin:

Early 19th century: from german rucksack, from rucken "to carry on the back" + sack "bag".

Examples:

1. He carried a rucksack on his back.
2. The rucksack was filled with camping gear.
3. The hikers had rucksacks with them.
4. The rucksack had a lot of pockets for organization.
5. He packed his clothes in the rucksack for the trip.