Below are the knives that most often go with me where ever I go. One of the two Leathermans is carried more often than the Benchmade South Fork folder (one of several Benchmades that may get occassionally used).
Both of the Leathermans are among the smallest, most spartan, and easiest carried of Leatherman tools (other than their "keychain" options). Both have blades that can be opened without unfolding the tools. Both have pliers, screw driver bits' and are overall quite thin. The larger one is called a Skeletool and the smallest the Juice. The Juice was discontinued for quite a while, but now some models are back in production. The larger skeletool has a pocket clip, but usually just ends up dropped into my left front pocket.