Gerber's EAB Lite is an example of well-executed minimum viable product. It is the smallest possible form you could have for a folding utility knife that takes standard blades.
There's a liner lock, and the grooves in the handle are meant to provide the grip you need on something this diminutive. The pocket clip lets it do double-duty as a money clip. As a bonus, it's easy on the eyes.
Overall, a handsome little piece of industrial design.
The company has priced it for $18, but on Amazon it's $13 and change.