Re: need sandpaper storage unit
William Duffield
For A-size sheets, I just use hanging manilla file folders in a file cabinet. The pressure mechanism to keep them all flat is built into the cabinet. For smaller pieces, I use 1/9 sheet, folded in thirds, and keep unused sheets in order by grit, in a wooden clothes pin, and keep the used folded sheets in a plastic yogurt cup until they are used up.
Probably some useless information, unless you have a ROS in a matching plastic box, I also have one of these for 3-1/2" round and triangular pads:

and one of these for 6" pads:







