If you think you can fit it into this can I bet it would be best because it has a handle.
http://www.armygear.net/store.cgi/0002a.html
11.75x6.75x8.25. I got the feeling you will have to go with the 20mm can but if you search at yahoo for (army surplus ammo can) you'll find a bunch of sites and most of them are cheaper than $25.00