Leatherman 3.875" Serrated Blade

This is a good pocket knife. The blade's big enough to be useful, but the knife's small and light enough that it's comfortable to carry in your pocket. You can deploy the blade with one hand, with the stud or blade launcher, which is handy. The clip also doubles as a bottle opener and a flat screwdriver (which the website doesn't mention). The rubber handle stays in your hand nicely for blade deployment, and is comfortable for cutting (unlike many metal handles). Every knife's a compromise, and this one is great for daily pocket use.