書包,小背包
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.
satchel n : luggage consisting of a small case with a flat bottom and (usually) a shoulder strap