OK, I've had two PM's requesting that I show a DIY scabbard that I made in my shop. Here's one that I made using walnut for a 25" bar:
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I used two 1/4" thick side panels, glued to 5/16" x 1/2" strips between them. The round end is the third piece cut the same thickness as the strips. You can use 1/8" thick pressed wood or masonite as an alternative to walnut side panels, perhaps even thin plywood.
I have not made one of these in about 10 years because (1) my saw collection grew faster than I could make them, (2) they tend to be a little heavier than I like, and (3) wood is not designed to be left out in the rain. So, I broke down and started buying plastic ones instead. Anyway, thanks for looking.