There are a few small items that you can add to just about any knife sheath and drasticaly improve your odds of survival. Especialy with a smaller knife, I'd add a *good* wire saw. I prefer the SAS style wire saw over the US issue saw; the SAS saw is much better made, less likely to break, and cuts much better than the USGI wire saw. Also, a 4-6 inch piece of hacksaw blade, with a wrap of duct tape for a "handle" is convenient for trap parts and other small sawing jobs.
Another good idea is to build a mini-survival kit and attach it in a pouch to your knife sheath. A fishing kit, fire starting materials, etc.. Sure, you're probably going to be carrying this stuff already, but having some "extras" directly attached to your knife is a great idea. Also, make sure that your knife is on your trouser belt. That way, if you're dressed, your survival kit is with you.
