A modern replacement for the classic pen knife, this pocketknife has a thin, 1.5-inch, razor-sharp blade that cuts boxes, cord, tape and tough plastic wrap without effort. Half the charm is its disposability: It costs about as much as a can of soda, so if you get to the airport and have forgotten it’s in your pocket, ditching it is trauma-free. I’ve found the handle grip to be excellent. The slipjoint blade stays in position open or closed. The slim, short design packs a lot of cutting power into a package with about half the volume of a pack of gum. A functional design with aesthetics worthy of MOMA. Derma-Safe also produce a hacksaw version they say will cut through metal as well as wood, which I’ve not tried.