You lost me on this. what in this list needs concealing? "I carry walking gear because I'm a walker" is a hard argument to beat. BUT carry that small knife in a hollow shoe and whoah! they discover that and you'd be seeing daylight a week later if you were lucky when stopped at any airport. The reason real spies hate gadgets.

You can talk yourself out of anything if you act dumb enough. "I was just looking for my flight and carry a store bought camera because I'm a tourist. Oh really? they are migs?" Goes down a lot better than "well err... about that camera concealed in my cigarette lighter"
simon