I have no idea if they still have them or not, but I bought a bag at Walmart a couple of years ago that was very very slim (almost like the Camelback pack) but has surprisingly deep pockets. Another idea...I went to an army surplus store and found a great messenger type bag andd a backpack that was awesome! It fit everything including my work shoes and wasn't bulky. I now carry a Timbuk2 laptop messenger when i carry a lot and one of their x-small messengers I got on sale at a shop here i town that was going out of business. Timbuk2 is having a sale right now with stuff up to 65% off if you wanna check it out. The also have something called an Outtawhack backpack that is a messenger style back with backpack like straps and a cross strap I think. Might wanna check there. Okay, I'm done.
Gray