stupid idea to carry a knife of any kind unless you've had knife training.i can almost guarantee that in a situation where you tried to use it, it'd end up being used on you. and if x person has a knife, it'd still be better to try and escape than pull your own out.
You guys don't need knives. without proper training, in the case of robbery they will just turn it on you, just give them what they want otherwise you may end up in a ditch.EDIT: Boltster beat me.
Cigarettes, Zippo lighter, keys, wallet, Android, headphones.