I carry a Leatherman Rebar when I know I'll need a few more tools in my pocket. It's only a few times a month but when I do it's indispensable.

The size is both small enough to fit comfortably in my pocket while be substantial enough to feel like a real tool. The tools I use the most are the pliers, Philips screw driver, and wire cutters.

This model locks the tools while they are open which I prefer but it lacks scissors, a replaceable bit driver and has, in my opinion, a light duty knife.