Multi-Tool
Christopher Locke
The pocket multi-tool: Pretty much every semi-sophisticated man has an opinion. This is the only one that counts. I carry a Kershaw knife everywhere I go, unless there's a metal detector. Do you need a screwdriver? Use a screwdriver. Pliers? Be a man and use proper tools. The only thing you really need to carry is a knife.
Of these three, I usually prefer the top one. It's a Kershaw Chive. It's small and feisty, so I put a strip of stair grip tape on the side for added friction. I did the same for the Kershaw Ember, but did not feel the need to do it to my Kershaw Leek. (That one was confiscated by the TSA, then sold to me, which is why it's named "Larry.")