I bought this sack pack to replace an earlier model and its even better.  What I love about it is that if you walk to work you can carry your water bottle (Camelback) and a thermos of coffee in it easily.  The single large zip pocket is large enough for head phones, keys, any small things that you might need.  The interior is large enough for papers, file folders and other things.  A computer fits, but it doesn't leave much room.  That said, its a great bag.  I know its for sports equipment, but if you walk to work, its a super bag.

Its a great Disney bag too!