I switched from Altoids tins to those pretty little Fench candy tins. They're round, and fold into each other. <br>With clear tape on the outside they're waterproof. I like a little rattle in them, and leave the outside trade packaging on. When I have to empty my pockets at a metal detector nobody gives it a second look, and I neither have to go to the trouble of opening it up and/or explaining to some moron what it is. A lesson I learned from my first one that I went to the trouble of stripping with paint remover. The inside is shiney enough for signalling anyway.