My base 'survival knife', a Cold Steel SRK, has a small diamond plate hone, large metal match and ceramic hone secured to the sheath under wrapped paracord. A second plate is taped to my pocket tin lid. Some knives, such as the AF survival knife are 'soft' for ease of sharpening. I tried it with the provided stone and quickly switched to a full Arkansas set before arctic survival school. First my edge succumbed.Tthen the small stone broke in half. I sharpened the blade on an expedient rock. Then the blade snapped splitting wood. Only sharp knives are interesting, and like firemaking I carry more than one, with suitable sharpening tools.