Packaging Corporation of America (PCA) is a producer of containerboard and corrugated products in the United States. In 2001, the Company produced approximately 2.1 million tons of containerboard, approximately 82% of which was consumed in its corrugated products manufacturing plants, and shipped approximately 26.1 billion square feet of corrugated products. In 2001, PCA produced approximately 1.3 million tons of kraft linerboard at its mills located in Counce, Tennessee, and Valdosta, Georgia. The Company produced approximately 0.8 million tons of semi-chemical corrugating medium at its mills located in Tomahawk, Wisconsin, and Filer City, Michigan. PCA leases the cutting rights to approximately 145,000 acres of timberland located near its Counce and Valdosta mills.