I am used to carrying a pocket knife. It is just the way I grew up, adult guys have a small working blade, for opening packages, cutting twine, whatever, and feel a little underdressed without one. I have a ColdSteel Braveheart sgian dhu for those occasions when I am kilted and the size of the blade is not an issue. Other times I carry their superedge, which while not intended as a sgian dhu, fits easily into my kilt hose top, and with only a 2" blade, is legal to carry in most places. Pentagon security had no issue with it beyond measuring the blade length against a template. The link to it is below. I prefer, unless I am going very formal, to carry a functional knife, that I don't need to worry about damaging the appearance of if I use it roughly. (Use as a tool, of course, not a weapon)

http://www.coldsteel.com/superedge.html

Geoff Withnell