My users just get tossed in a box.
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Comes down to personal choice, do you want to display them or store them? I display a lot of mine just for my own enjoyment, but the higher dollar knives get put in the gun safe just in case something should happen while I am away. My father actually made me my display case awhile ago, pretty easy to do if you have the time (he is retired ) and tools.
Untitled by Danny Nystrom, on Flickr
^^thats a nice case 👍