I use a discarded computer floppy disc index box that held the old fashioned large size discs (5-1/4”) to store my orbital sanding discs. This works perfectly because the various grits can be organized in groups, starting with 60s and moving on up to the 220s and higher. I use the index dividers to make the divisions easily seen. This makes them easy to select even if my safety glasses are dusty (a common problem when sanding). If you don’t have one of these computer disc boxes, you can probably find one at a garage sale. In the way of computer stuff, the 5-1/4” discs’ time has passed.
– Vincent Koehler