Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

satchel
     n : luggage consisting of a small case with a flat bottom and
         (usually) a shoulder strap