I keep an Opinel No. 8 pocket knife in most of my jackets. This one has been with me for years.
I buy Opinel No. 8 pocket knives for a lot of reasons. They are elegant in their simplicity. The carbon steel blade is excellent, stays sharp and develops a lovely patina. The handle is a simple piece of wood that fits well in your hand. The locking neck ring is pretty ingenious, and down right fool-proof if you use it.
Best of all, they are cheap and I don't mind losing them when I've forgotten to remove one on its way to the airport. The "No.8" 3.35in blade, perfect for most of my camping needs, is not allowed to board a plane on my person. Frequently, like last weekend, the heroic defenders of democracy that are the TSA just let me pass thru, but on occasion they will confiscate it.
I've had this blade since 2012. The patina started out by stabbing a lemon, but over the years has taken on a life of its own. While the ink on the side of the handle has slightly worn off, this knife just keeps getting better.
I hope I don't lose this one, it has ranged from Baja to Canada.
You can decorate, carve or otherwise modify the handle to your liking.