ruck·sack [rucksackrucksacks] BrE [ˈrʌksæk] NAmE [ˈrʌksæk] (BrE) (alsoback·pack NAmE, BrE) noun a large bag, often supported on a light metal frame, carried on the back and used especially by people who go climbing or walking See also: ↑backpack
Word Origin: mid 19th cent.: from German, from rucken (dialect variant of Rücken ‘back’) + Sack ‘bag, sack’.
Example Bank: •He had a large rucksack on. •He had very little in his rucksack. •She slung her rucksack over her shoulder. •She slung the little rucksack on her back.