I travel quite a bit on business, and sometimes, if I have a little downtime, I stop by an LFS or two in whatever city I happen to be in. Sometimes I find something I'd like to buy, but I never have, just because I don't really know how to travel back home with the fish/coral/invert. What's the best way to get such a purchase through security and back home while flying regular commercial, U.S. domestic airlines? I'm sure there are others who frequent this forum who have tried this - tips, hints, protocols?