also: ナップサック
noun
A bag carried on the back, often used for hiking or travel. The word is a loan from German Knappsack.
from German Knappsack
ナップザックに着替えを詰めて山に行った。
I packed a change of clothes in my knapsack and went to the mountains.
Standard katakana spelling from German Knappsack.
Alternate spelling; less common than ナップザック.
リュックサック is a more common modern word for backpack; ナップザック is an older loanword and less frequent.
From German Knappsack.