Profile: National Paperboard Group, Inc. specializes in providing paperboard for printing and packaging services. Bulk packaging products include bulk bag, tape & sewn, tape & tied liners and liquid liners. Our liquid liners are leak proof liner and is made of multiple layers of flexible poly film. These liners will fit into any shape, making them ideal for use in boxes, crates, barrels and cages. Paperboard grades include clay coated kraft, white one side outdoor board, blister board, skin packaging board and grease resistant board.