Pinit FILLER PAD for Rigid Mailers. 12-3/8 x 17-5/8". 200-lb-test corrugated cardboard. SKU: F1318 (0)No Reviews yet Add to Shopping Cart Details FILLER PAD for Rigid Mailers 12-3/8 x 17-5/8" 1/8" thick. 200-lb-test Corrugated Cardboard. Use with our Rigid Mailers MRTT1318W, MRTT1318K & MRTT1... Details Back DetailsFILLER PAD for Rigid Mailers 12-3/8 x 17-5/8"1/8" thick. 200-lb-test Corrugated Cardboard. Use with our Rigid Mailers MRTT1318W, MRTT1318K & MRTT1318WPS.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