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Smurfit WestRock manufactures corrugated packaging and consumer packaging, such as folding cartons and paperboard. After the merger of Smurfit Kappa and WestRock in summer 2024, Smurfit WestRock became the largest producer of containerboard in the world, with substantial operations in North America, South America, and Europe.
Packaging Corp. of America is the third-largest containerboard and corrugated packaging manufacturer in the United States. It produces over 5 million tons of containerboard annually. The company's share of the domestic containerboard market is roughly 10%. PCA differentiates itself from larger competitors by focusing on smaller customers and operating with a high degree of flexibility.