dodgecity,
for most of my crook'd knives i use rubber hose of one type or another to protect the edges in my tool basket, around the shop, and in the yard. they are cheap, easy, and work extremely well. for taking around i prefer a scabbard. i usually make one favored style and so many of my knives fit into the same scabbard(hardshelled inside and sheethed with soft leather).
in your original post you mentioned your knife's utility. not only are they excellent for tooling concave surfaces, they are excellent for shaping up dimensioned stock from riven blanks also. much more agile than drawknives, they carve to lines and plane surfaces lickidy-split. for most greenwoodworking i make two blade shapes. the first i call my 'beavertooth' which has a rather shallow(about #3 gouge)arc that runs the length of the 3.5" blade. the second is flat with no upturn. the first is excellent for quickly removing stock and some flat and concave finish work. the second is used for all shaping and finish planing except concave surfaces. one can sit down with a fresh straight-grained piece of riven hickory and with a crook'd knife and dowelplate can whip up a top line ramrod in a few minutes.
so enjoy your new tool. i hope it gives you many hours of pleasant use.
take care, daniel