a small rucksack 小背包 He had walked into the school yard that morning with his knapsack on his back and his lunchbox in his hand. 那天早上,他背着小背包拿着午餐盒走进了校园。
Word Originearly 17th cent.: from Middle Low German, from Dutch knapzack, probably from German knappen ‘ to bite’ + zak ‘sack’.