Fellas if you are in the field a few days at a time which may include in the rain or wading through creeks, would having a leather sheath increase chance of rust to the knife? I am thinking synthethic sheaths (which I currently use) hold less or even no water against the blade. Or would leather that gets soacked be a non issue with proper oiling to tbe blade each night? Just curious as to the realities with high carbon blades.