I missed one on ebay for $30 and then found them new for $50 at this site if anyone needs a pack. I here they are pretty roomy and the shoulder harness is adjustable for different heights.
http://www.onecall.com/ProductDisplay.mpt?ProductID=5961&FEID=230&PMNID=416&ASaP=1#
http://www.onecall.com/ProductDisplay.mpt?ProductID=5961&FEID=230&PMNID=416&ASaP=1#
