I find swiss army knives to be extraneous and totally useless.

I do carry two pocket knives on a daily basis. I carry a kershaw, specifically the non-serrated version of this knife , and I carry a fully serrated spyderco .

Why? Mainly because knives are so damn useful on a daily basis. I carry the fully serrated knife just in case I ever end up having to cut through a seatbelt or something similar. And, uh, because my Glock can't cut things...