I did a search and couldn't find the exact chrome cigarette case kloan used, but there are several nice ones that would probably work. Some are too thin, I think, but cases like this one should do nicely. You could hide the knob and jacks beneath the hinged lid to protect them when not in use.
You'd still have trouble taking it on an airline, but I like the cigarette case idea better than using mint tins. Plus, Altoids is getting touchy about selling amps housed inside their tins anyway.