The slip cases are an interesting idea. I don’t think ultra pro makes them and I’m kind of invested in a couple hundo of ultra pro equipment that matches nicely. I like the idea of those slip cases though.
Gonefishin I have been doing the same thing with my graded cards in sets. Photographs in the binders. Great minds.
Sounds like most go for vertical although we have a dissenting opinion on that one and the guy is a Yaz fan so he must know what he’s talking about