I like the Avenir Bigmouth underseat bags and S&W 38 spcls. The medium and large sizes are expandable, I think. Amazon's prices are good. I have the small size Avenir which is, well, very small, and great for the basics (IDs, credit card, $, keys, cell phone, patches, even a small camera, gps, or tube), but you would probably want a med. or lg. They seem very well made and aren't clunky looking.