I have plastic holders I bought at Wal Mart. When I needed more (it is very dusty in here with the animals and sugar sand) and WM didn't carry them, I got two from connecting threads like Jackie said, and they were not expensive and these are double sided. Work great and I taped paper telling what colors are in each one for sewing, embroidery and quilting. Use plastice totes from WM for material and go through it occasionally to air it.