Those little round disks seem to congregate everywhere so I found some scrap paneling and an old piece of PVC and made a two story sandpaper storage carousel. I suppose you could put some bearings under it to make it handier to turn, but I usually keep it where I can grab the 60 grit.
After many requested I provide a good plan for a downdraft table, here are the plans for my table that I use. Building a downdraft table is a must for most hobbyist shops that do lots of power sanding and carving. So is building or buying a portable hood that can be directed right next to the work.