Sharpening your survival knife is a very simple task and one that will pay dividends. A sharp knife makes every outdoor task easier (at least the ones you need a knife for. A diamond file gives you a simple, reliable way to sharpen your knife anywhere, even with zero prior experience. If you can hold a steady angle, you can sharpen your blade. This guide walks you through the exact process we teach in our classes and in the video below. ESEE 4 - My favorite field knife Jump A