[PineTar5]

Using Card Saver (I's in pic) semi-rigid holders in 4-pocket pages I don't worry about the case edges rubbing the pages since there is plenty of protection. There is also a small amount of room top & bottom.


Yes, the right pic in my original post shows a binder on bottom of stack housed in a USPS Flat Rate box. I just cut the end off to fit. You can get a shipment. Open on one end then cut that end off to have a perfect slip case.
The USPS box and 3" Ultra Pro D-ring binder (photo is office binder of same size) is a "poor man's" version of the Archival Methods binders.

The slip cases allow the binders to be shelved in a hanging from 3-rings manner if desired since they are a rectangular package. You can do the same with UniKeep although they don't stand alone on side as well.