Rule #9 always carry a knife - Kershaw Cryo II Blackwash Assisted Folding Knife by Rick Hinderer

Carbon steel blade ensures a hard but sharpenable edge. The warrantee will replace it (the blade)for free.
The finish protects against rust or light glare and the pocket clip, a bit tight when new ,is set up to adjust to your desired position of carry. The lock was a bit tight at first and wouldn't fully engage, but with use it broke in quite nicely in a weekend of familiarization
The assisted opening feature along with the thumb stud makes for easy, and quick one handed opening. Closing can be a bit tricky, but that you should have time to do safely.
I bought this one for daily carry and find it easy to forget I have it. Not something to be advised when flying or visiting the local courthouse.