Have growing number of folders. Can anyone recommend a 6 inch...

A Plano pistol case should work well. specifically, I'm thinking the hard cases with egg crate foam liners. They're cheap, and work very well for holding flat items securely.
 
Not exactly what you're asking for but...
Spyderco Small Spyderpac - Holds 18 and folds.
Or you can get the Large which holds 30 and folds up as well.
They also have steel D-rings so you can hang this on your door or wall. Or when you're going somewhere, if you want to take your knives with you, you can hook the carry strap to these and carry it.

I need to get a couple of these lol.
 
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