Pinit FILLER PAD for Rigid Mailers. 16-1/4 x 20-3/4". .030" thick chipboard. White one side. SKU: F1620CHP (0)No Reviews yet Add to Shopping Cart Details Pad fits in rigid mailer MRTT1721K, MRTT1721W & MRTT1721WPS. 1000 quantity is wholesale priced and a +FREIGHT ITEM. Call For Freight Quote. Details Back DetailsPad fits in rigid mailer MRTT1721K, MRTT1721W & MRTT1721WPS. 1000 quantity is wholesale priced and a +FREIGHT ITEM. Call For Freight Quote. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review