While it's true that Wayne Robbins makes the zippered cases with the Randall logo; based on conversations that I've had with Wayne, I was of the impression that Randall dealer Mr. Tom Clinton had exclusive rights for sale of the RMK marked cases and was unaware that these were available through RMK direct...I guess that just goes to show that you learn something new each day...
Nonetheless, Wayne is just a super guy to deal with, and can be reached at (815) 885-3712. On a side note, Wayne also makes the zippered cases for most other major manufacturers such as Spyderco too.
The quality of these cases is superb, and if helps you make your decision to buy, we own and use over 100 of Wayne's cases....not only for RMK's, but for everything else as well.
My only caveat here would be, buy more than you'll 'ever' need, because you'll simply fall in love with them, and soon find out that you need more...we'll be putting in our 4th order soon, for 20 more.
But, to answer your question, the cases we have are the smaller ones...11", 14", and 17", and they fit everything from the smallest miniatures to those with 8" blades, and have no problem fitting our large #18 into a 17" pouch...but that's the limit, a #12-9 would need to go up one size.
Mel