The Gerber Shard is the kind of tool you forget you have until the exact moment you need it. It packs seven functions, a pry bar, bottle opener, two flathead drivers, a cross driver, a wire stripper, and a lanyard hole, into a single flat piece of stainless steel with nothing to break, hinge, or lose over time.
It weighs under an ounce and is airline safe, so it lives on your keychain through airport security without a second thought, which is rare for anything actually useful in a pinch. The titanium nitride coating adds a bit of extra corrosion resistance for a tool that rides in your pocket every day.
It will not replace a real toolbox, and the small drivers limit how much torque you can put behind a stubborn screw, so do not expect it for serious work. For nine dollars and everyday fixes, though, it is hard to beat.