I agree with Darcy. I want all my paper with me, but I don't want to deal with the cardboard boxes.
I recently purchased an abrasives systainer for my 6 inch paper and a Maxisystainer for holding other stuff. I found that I have too much sandpaper to fit in the abrasive systainer that I got, so I figured, I've got the Maxi, I'll use that and just have to buy another.
So after much brainstorming to figure out the design and paper direction (rows) for the insert, I came up with this that'll yield me the maximum disc storage in the Maxi. I originally planned to make dadoes every so many inches for the separators, but decided against it because the case width wouldn't give enough room for a thick enough insert and I can also pack in as many discs as I want. I'll be using a gloss varnish to protect the whole insert from the effects of humidity and I'll have to label the dividers.
I used 1/4 inch and 1/2 inch poplar, 3/16 inch hardboard aka Masonite, Gorilla Glue clear and 23 gauge pin nails. More uses for poplar including the photo backdrop!
Now there's plenty of room for more sandpaper. I'll be making up another for my 5 inch discs.