Update; I now have three of these sheaths available, since a couple of people who committed to buying one bailed. I'll post up new pictures later in the day
these two sheaths are available. I'm selling them for $150USD shipped expedited to the US, paypal fees included (less if you're in Canada).
These sheaths are designed to lock the knife in so that it will absolutely not come out unless you want it to. There is also a friction fit built in so that if you are using the knife a lot and it's in and out of the sheath constantly, you push it in part way and it will stay there unless something weird happens.
The sheaths are quite hard, and there will be a break in period. In warmer climates, that break in period will take less time since the wax will soften a bit in the heat.
These sheaths are saturated with wax and contain very little in the way or oils or moisture. I have not had a knife rust inside one of my sheaths, even when left there wet. That's not a guarantee- you have to take care of your stuff- but it's an honest observation.
The thread is waxed polyester which I've been using for years and it is very strong. I use Lepage Heavy Duty contact cement, which I've found to be strong and resistant to temperature fluctuations.
I am the first to admit that there are much better sheath makers out there who make much more visually appealing sheaths with fancy materials. These are no frills, working man sheaths, whose design is informed by my own experience using the FK2, and built in a way that they should last decades with proper care. Maybe more.
Thanks for checking them out, and for your ongoing patronage of CPK.