I agree with TekDragon on all aspects of the case.
However I am under the impression this was a salesman’s item to carry samples. In addition, I have seen these labeled as blades cases.

This is one of my favorite cases. I wish they'd update this one. I'm sure most of you, like me, have multiple pairs of Oakleys and having a bunch of the individual cases laying around is a little messy and kind of a pain. I think the original idea was a place to put multiple M-Frames since on the right side there are 3 "lens" slots, and area for extra earsocks, and then four larger openings for frames with glasses. I use all seven slots for glasses. I have metal frames up front and larger glasses in the other openings. I used to have only one, but have been very lucky on e-Bay and found two others. For all you with big collections out there, I don't think there's a better way to go (if you can find them).