I have a medium on order with Travis at the moment. I've checked them out in person in SF and a few friends have them - they're great bags. Certainly built well and for riding. Travis really knows how to make a backpack for riding on your bike.

I've come from an Ortlieb to wanting a shorter bag (the Ortlieb is a tad tall for my liking -- I'm 5'8) with better pockets and designed aesthetically to my specs.

There are a few threads with reviews of the backpack but forum member jacobs. Do a search for "freight bags" and look for the messenger bag thread (the massive one -- lots of reviews).

If you're in NY, King Kog has them and Trackstar may as well.