I carry a Kershaw with an "opening assist" function. Kevlar grips, Tonto blade. Easy, single hand use.
Certain Eastern cities have length limits on blades (yes its true) so be aware of where you are traveling....
D.C. (shocker)
(b) No person shall within the District of Columbia possess, with intent to use unlawfully against another, an imitation pistol, or a dagger, dirk, razor, stiletto, or knife with a blade longer than 3 inches, or other dangerous weapon