n. 书包, 小背包

[ noun ]
luggage consisting of a small case with a flat bottom and (usually) a shoulder strap
<noun.artifact>

Satchel \Satch"el\n. [OF. sachel, fr. L. saccellus, dim. of
saccus. See {Sack} a bag.]
A little sack or bag for carrying papers, books, or small
articles of wearing apparel; a hand bag. [Spelled also
{sachel}.]

The whining schoolboy with his satchel. --Shak.