The CRKT RSK Mk5 is a nice knife cursed by a terrible sheath.
I’ve been EDCing the knife since my Nemesis Hellion was lost last November. Unfortunately, the “glass filled nylon” sheath that the RSK Mk5 ships with is a poor design. The grommet in the tip is too small to accept a piece of paracord. This was done to keep the overall size of the sheathed knife small enough to fit inside an Altoids tin. I have never understood the obsession with the Altoids tin survival kit. I prefer to carry a knife about this size around my neck.
Some time ago I purchased a new sheath for my RAT Izula from a fellow on eBay who goes by lemonwoodgallery. I was pleased with that purchase, so as soon as I bought the RSK Mk5 I shipped it to him to make me a custom kydex sheath. It’s nothing fancy — just your standard taco style sheath with two grommets at the top for a piece of paracord and one on the side for retention. This is the same design as the sheath for the Nemesis Hellion, which served me well for 6 years. The new sheath has held the RSK Mk5 around my neck for about 8 months now. It’s a much appreciated upgrade.