I like my Vandal. Had it around a month or so. It is worth mentioning that it is MADE IN USA with a LIFETIME warranty. Most of the Chinese bags posted in here are crap when it comes to build quality, materials, and warranty. I had an original Chrome Citizen messenger bag that is still running strong after years of abuse. Support your fellow bikers and countrymen. I don't think you'll find anything like the Vandal and certainly not for the price of a Chinese bag.

These look nice, USA made and waterproof but they don't appear to be expandable. If you don't need to carry a keg or case of bottles it might work.

http://www.ortliebusa.com/cartgenie/prodList.asp?scat=3