If you really want to get their tits in a wringer, get a couple of those new liquor bottles that come in the 100ml size. 100ml is the official limit and that equates to 3.38 ounces. Also, in Europe 100ml tubes of shaving creme are available and they always look at it an me cross-eyed because it looks way over 3 ounces......until I point out that it is legal.