A good knife sharpener is the required companion piece for any knife or multi tool that sees regular use. Knife sharpening kits come in all shapes and sizes. Some knife sharpening kits are designed so it is impossible to make a mistake and others require a little practice to use effectively. The knife sharpeners listed below are top quality, proven designs that will give your knife the razor edge you want the first time. Knife sharpening systems come in two varieties; stay at home and portable. I recommend one of each. Use your home based knife sharpener before heading into the field, then after some heavy use, pull out your portable knife sharpener and quickly refresh the edge for more cutting.