rucksack
/ˈrʌkˌsæk/
noun
- A bag that you carry on your back, used for hiking, travel, or carrying books and supplies.
- The traveler carried a lightweight rucksack instead of a heavy suitcase.
- He slung his rucksack over one shoulder and headed to class.
- She packed her rucksack with water, snacks, and a map for the hike.