I have not tried any of their products; I've heard positive things about these two:

http://www.condoroutdoor.com/147_urban_go_pack.aspx
http://www.condoroutdoor.com/Condor-160.aspx

Disclaimer: I have no affiliation with Condor.

Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday