Something that "almost always" gets overlooked, with regards to sheaths, is a "drain hole". Why not have one? Make perfectly good sense to me.
Stay Sharp,
Capt. Chris
PS: Here's what I'm talking about, standard on RMK's Dicer's knife (Model #16-7"). On a pouch style sheath, such as the 4 & 5" Model 10's supplied sheath it could be drilled through the very bottom...CCS