Leatherman Rebar
It's tough to think of anything other than Leatherman when considering a multi-tool — and for good reason, their history of making useful tools contained inside pliers started when they invented the things. The Leatherman Rebar is a nod to that heritage, though it's not without a few modern touches (things like the replaceable 154CM wire cutters). Measuring just four inches in length when closed, it packs pliers, a crimper, multiple knives, a file, a saw, small, large, and phillips screwdrivers, and an awl with a thread loop. Oh, and let's not forget the ruler, bottle opener, can opener, wire stripper, or lanyard ring, nor the stainless steel body and black oxide finish.