I've found a Case Mini Trapper with a carbon steel blade in a properly folded hankie/bandana in your rear pocket rides well and is not visable or prints at all. It is readily available for quick accsess and atracts no suspicion, though it is not a locker. It's quite thin and will easily hold a razor edge but will not stand extreme abuse. The carbon steel ones are no longer in production but are easily found at gun and knife shows in new condition for 30 or 40 bucks. I use one for a backup/spare to a Benchmade AFCK.