I am looking at the Crewman with the same idea, time to upgarde. I was wondering how much the sheath would hold and was looking at sheaths from www.specopsbrand.com.
I think I'd start with a small sharpening device and add things that didn't fit in the PSK like a real signal mirror, Allway tool FS 2 saw, bottle of water puri tabs and then backup fire making and maybe a small AA or AAA flashlight..Should be able to wrap some 550 cord etc around the sheath.
Dave