bagpack

例句：

1. 1. I need to carry my backpack to the bus stop.
   我需要把我的书包带到公交车站。
2. 2. The hikers carried their heavy backpacks up the mountain.
   登山者背着沉重的背包上山。
3. 3. He was carrying a large bagpack when we met him.
   我们遇见他时，他正背着一个大背包。