I've been using a plastic tool box zip-tied to the rear rack of my Vinson. It measures 26"Wide x 11"Tall x 9"Deep. It has 2 latches which keeps it closed and there is virtually no rattle from it when I ride. I found it at work where it was disgarded since the top handle broke(which is no big deal since I won't need to carry it). Obviously, the cost was zero. It also leaves plenty of room for a duffle bag to bungee on for longer rides if I want to bring clothing and the like.

 

Hey--if you want a great looking box, that is sturdy enough to withstand almost anything you'll probably ever do to it--check out the new Tamarack website!!! I'm sure you'll find an awesome box (or bag) that fits your needs. Happy Riding!!