Collapsible Drying Rack The Flip-Pal team built two drying racks capable of drying 400 photos at a time using clothes pins. They are collapsible so that they could be used by other volunteer organizations helping out with the Colorado flood rescue operation. The Flip-Pal team constructed two drying racks capable of drying 400 photos at a time using clothes pins. They are collapsible so that they could be used by other volunteer organizations helping out with the Colorado flood rescue operation.