I've been carrying a SAK classic on my key-chain for a while now (I work in a place where you can't carry anything bigger), but I don't really use the other tools besides the knife. Now, I've had a problem with the non-locking blade. Maybe I'm just not careful enough, but I have had a scare twice where the blade almost folded over onto my fingers. Once while stropping (so you see where the fear comes from... it's razor sharp!) and another time--today--while using it to cut the wrapping off the top of a water bottle (the big, heavy kind you stick in a water cooler). The blade just kind of did it's thing and slipped down and almost closed on my fingers. Scary. So I said to myself after that, "No more... I'm trading this out for a lock back design."
I just ordered a Buck Nano Bantam. Seems that people generally like it, and it is key-chain-size. Your thoughts?
I would forgo the nano bantam. I don't care for the 420J2 steel.
Like you, I work for a corporation with strict limitations on what is allowed.
2" blade and 4 1/2" overall opened length. That overall length is hard to meet. Sometimes I cheat a bit on that one.
I carry a Vic Classic on my keyring for the toothpick and the nailfile/screwdriver.
But I don't much care for it for cutting. The thing I find about small knives is that it is hard for me to hold them to use them. I don't have that large of hands. I just find it hard to manipulate a miniature knife. So what I've been seeking is a knife with a handle that meets the length requirements and still gives me a secure grip.
My thoughts on a couple of knives I've tried.
Spyderco Ladybug in VG 10. Blade shape wasn't good for me. Hard to hold. Outstanding steel.
Buck Colleague - very nicely made, excellent blade shape, Steel at 58HRC, no key ring hole.
For a lockback, I've settled in on a Boker Subcom. That wide handle really gives me something to grab. Very useful little fella.
But the knife I end up using the most is a Case Tiny Wharncliffe Trapper. The handle is thick enough to give me a good grip. Peels an apple quite nicely. And the Wharncliffe blade is great for packages. I think the Tiny Trappers are out of production, but some of the online stores still have some. Recommended.