I don't own a dirk, and don't want one, even though there are some knifewrights here who make beautiful ones.
Most of the time I carry a fairly useless sgian dubh in my sock, but I always have my Swiss army knife (which I got in Switzerland, thank you very much)in my sporran. It has a corkscrew, bottle opener, two blades, scredrivers, and all those other handy things, chief of which is the toothpick.