SAK. It's the Saint-Bernard-With-A-Keg-Of-Rum of the knife family.
Hell, I bet even if you accidently took one into one of our "Weapons Free Zones" like a school or a courthouse, nobody'd raise an eyebrow at it.
At my school a sak would be a negative but a leather man is fine... In fact, the school has purchased a few for the tech theater class.