I can't speak for those particular knives but I have a Cold Steel Bushman and I found that the most useful thing I could fill the handle with is ParaCord. I cord-wrapped the handle and then stuffed a hank of cord (still attached to the cord wrapping the handle) into the handle. I, too, carry an altiods PSK with all the fixin's so I wasn't trying to re-package those supplies. Having a spare bit of room in the handle of the Bushman presented a way to carry a bit of extra cordage. I believe that the handle space is about the same between these knives. The Chris-Reeves knives handles form closed water-tight containers which presents some options That I didn't have with the Bushman so I might have packed it with something else...

Just my $.02