This is the 7100th most frequent Japanese word.
リュック
Backpack.
The word リュック is used as a noun to refer to a backpack, specifically one intended for outdoor or general use.
彼はアウトドア活動のために大きなリュックを購入した。
He bought a large backpack for outdoor activities.
The word リュック is employed here to describe the backpack being carried, emphasizing its physical position impacting the surroundings.
電車でリュックを背負ったままいると、周りの人に迷惑をかけることがあります。
Wearing a backpack on your back in the train might inconvenience others.
In this sentence, リュック refers to a specific backpack being searched or accessed for its contents.