My field kit usually consists of a Fallkniven DC3, a small leather strop loaded on the rough side & bare on the smooth, a couple of small sheets of wet/dry sandpaper and a small cloth loaded with anti-corrosion product (Tuf-Cloth or Frog Lube). Sometimes the DC3 is substituted by a DC4, D3, D4, a DMT XC mini or small ceramic stone and sometimes includes a short ceramic rod or diamond rod if I have a serrated edge with me. I keep a kit in my truck and in my go to packs & bags. Small & simple yet able to perform minor repairs as well as maintain a refined edge. I find that an Altoid tin or small Otterbox works well to hold the kit and can double as a small table top to work on.