The only diaper bag my wife and I found worth having raising our kids was in the form of a backpack. It was more rugged than 99% of the rest of 'em, handier than hell and packed more too. I think it may have been a JanSport. I dunno, Skip Hop makes one (see http://www.landofnod.com/family.aspx?c=862...4427&pc=62) similar. Diapers only last a couple of years but a leather daypack could last a lifetime, so build in baby features. Just a thought. We kept using ours for 9 years until it was stolen from our car.
Mark