The Spyderco Dog Tag looks just like a dog tag from afar, and is about the same size as one. But this particular pendant can be transformed into a knife, albeit one with a really small blade. When folded, the thing measures 2 inches in length, and the blade extends that to 3.23 inches overall when it’s unfolded. That means you get a very modest 1.23 inches of blade to play with, but if all you want to do is cut some rope, or open up some boxes, that’ll be plenty. The blade and handle are coated with a stealthy black titanium carbonitride, and the whole thing weighs about 1 ounce. It’s $92.