Packaging Corporation of America manufactures and sells containerboard and corrugated packaging products in the United States. The company operates through three segments: Packaging, Paper, and Corporate and Other. The Packaging segment offers various containerboard and corrugated packaging products, such as conventional shipping containers used to protect and transport manufactured goods; multi-color boxes and displays that help to merchandise the packaged product in retail locations; and honeycomb protective packaging products, as well as packaging for meat, fresh fruit and vegetables, processed food, beverages, and other industrial and consumer products. This segment sells its corrugated products through a direct sales and marketing organization, independent brokers, and distribution partners. The Paper segment manufactures and sells commodity and specialty papers, as well as communication papers, including cut-size office papers, and printing and converting papers. This segment sells white papers through its sales and marketing organization. The Corporate and Other segment includes corporate support staff services and related assets and liabilities; and transportation assets, such as rail cars and trucks for transportation. Packaging Corporation of America was founded in 1867 and is headquartered in Lake Forest, Illinois.

Sonoco Products Company, together with its subsidiaries, designs, develops, manufactures, and sells various engineered and sustainable packaging products in North and South America, Europe, Australia, and Asia. The company operates Consumer Packaging and Industrial Paper Packaging segments. The Consumer Packaging segment offers round and shaped rigid paper, steel, and plastic containers; metal and peelable membrane ends, closures, and components; thermoformed plastic trays and enclosures; and high-barrier flexible packaging products. The Industrial Paper Packaging segment provides paperboard tubes, cones, and cores; paper-based protective packaging products; and uncoated recycled paperboard products. It also offers various packaging materials, including plastic, paper, foam, and other specialty materials. Sonoco Products Company sells its products in various markets, which include paper, textile, film, food, packaging, construction, and wire and cable. The company was founded in 1899 and is headquartered in Hartsville, South Carolina.

Sylvamo Corporation produces and markets uncoated freesheet for cutsize, offset paper, and pulp in Latin America, Europe, and North America. The company operates through Europe, Latin America, and North America segments. The Europe segment offers copy, tinted, and colored laser printing paper under REY Adagio and Pro-Design brands; and graphic and high-speed inkjet printing papers under the brand Jetstar; as well as produces uncoated freesheet papers. The Latin America segment focuses on uncoated freesheet paper under Chamex, Chamequinho and Chambril brands, as well as produces HP papers. This segment also operates integrated mills and non-integrated mills. The North America segment offers imaging, commercial printing, and converting papers, as well as uncoated papers under Hammermill, Springhill, Williamsburg, Accent, DRM and Postmark brand names. It distributes its products through a variety of channels, including retail merchants, e-commerce, agents, resellers, and paper distributors. The company was founded in 1898 and is headquartered in Memphis, Tennessee.

Greif, Inc. engages in the production and sale of industrial packaging products and services worldwide. The company operates through Global Industrial Packaging; Paper Packaging & Services; and Land Management segments. The Global Industrial Packaging segment produces and sells industrial packaging products, including steel, fiber, and plastic drums; rigid and flexible intermediate bulk containers; closure systems for industrial packaging products; transit protection products; water bottles, and remanufactured and reconditioned industrial containers; and various services, such as container life cycle management, filling, logistics, warehousing, and other packaging services to chemicals, paints and pigments, food and beverage, petroleum, industrial coatings, agriculture, pharmaceuticals, mineral product, and other industries. The Paper Packaging & Services segment produces and sells containerboards, corrugated sheets and containers, and other corrugated and specialty products to customers in the packaging, automotive, food, and building products markets; and produces and sells coated and uncoated recycled paperboard, and recycled fiber. This segment's corrugated container products are used to ship various products, such as home appliances, small machinery, grocery products, automotive components, books, and furniture, as well as various other applications. The Land Management segment engages in harvesting and regeneration of timber properties; and sale of timberland and special use properties. As of October 31, 2023, this segment owned approximately 175,000 acres of timber properties in the southeastern United States. The company was formerly known as Greif Bros. Corporation and changed its name to Greif, Inc. in 2001. Greif, Inc. was founded in 1877 and is headquartered in Delaware, Ohio.

Clearwater Paper Corporation manufactures and supplies bleached paperboards, and consumer and parent roll tissues in the United States and internationally. It operates through Pulp and Paperboard, and Consumer Products segments. The Pulp and Paperboard segment manufactures and markets bleached paperboard; Solid Bleached Sulfate paperboard that is used to produce folding cartons, liquid packaging, cups and plates, blister and carded packaging, and top sheet and commercial printing items; and hardwood and softwood pulp, as well as offers services that include custom sheeting, slitting, and cutting. It sells its products to carton converters, folding carton converters, merchants, and commercial printers. The Consumer Products segment provides a line of at-home tissue products, including bath tissues, paper towels, facial tissues, and napkins; recycled fiber value grade products; and away-from-home tissues. This segment sells its products to retailers, including grocery, club, mass merchants, and discount stores. The company was incorporated in 2005 and is based in Spokane, Washington.

Mercer International Inc., together with its subsidiaries, manufactures and sells northern bleached softwood kraft (NBSK) and northern bleached hardwood kraft (NBHK) pulp worldwide. The company operates through two segments, Pulp and Solid Wood. It manufactures, sells, and distributes pulp, electricity, and chemicals through pulp mills. The company also manufactures, distributes, and sells lumber, cross-laminated timber, finger joint lumber, glue-laminated timber, wood pallets, electricity, biofuels, and wood residuals. In addition, it generates and sells green energy produced from biomass cogeneration power plant to third party. Further, it produces and sells NBSK pulp manufactured from softwood; green energy using carbon-neutral biofuels, such as black liquor and wood waste; tall oil from black liquor for use as a chemical additive and green energy source; bio extractives and biomaterials, including lignin, turpentine, cellulose filaments, and sandalwood oil; and biofuels; as well as provides transportation and logistics services. The company sells its pulp to pulp markets, integrated paper and paperboard manufacturers; and lumber products to distributors, construction firms, secondary manufacturers, retail yards, and home centers. Mercer International Inc. was founded in 1968 and is headquartered in Vancouver, Canada.

Rayonier Advanced Materials Inc. manufactures and sells cellulose specialty products in the United States, China, Latin America, Canada, Japan, Europe, Latin America, other Asian countries, and internationally. It operates through High Purity Cellulose, Paperboard, and High-Yield Pulp segments. The company's products include cellulose specialties, which are natural polymers that are used as raw materials to manufacture a range of consumer-oriented products, such as liquid crystal displays, impact-resistant plastics, thickeners for food products, pharmaceuticals, cosmetics, cigarette filters, high-tenacity rayon yarn for tires and industrial hoses, food casings, paints, and lacquers. It also offers commodity products, such as commodity viscose pulp used in woven applications, including rayon textiles for clothing and other fabrics, as well as in non-woven applications comprising baby wipes, cosmetic and personal wipes, industrial wipes, and mattress ticking; and absorbent materials consisting of fluff fibers that are used as an absorbent medium in disposable baby diapers, feminine hygiene products, incontinence pads, convalescent bed pads, industrial towels and wipes, and non-woven fabrics. In addition, the company provides paperboards for packaging, printing documents, brochures, promotional materials, paperback books and catalog covers, file folders, tags, and lottery tickets; and high-yield pulps to produces hardwood aspen, maple, and birch species for paperboard, packaging, printing and writing papers, and various other paper products. The company was founded in 1926 and is headquartered in Jacksonville, Florida.

WestRock Company, together with its subsidiaries, provides fiber-based paper and packaging solutions in North America, South America, Europe, Asia, and Australia. It operates through four segments: Corrugated Packaging, Consumer Packaging, Global Paper, and Distribution. The Corrugated Packaging segment produces containerboards, corrugated sheets, corrugated packaging, and preprinted linerboards to consumer and industrial products manufacturers, and corrugated box manufacturers. It also provides structural and graphic design, engineering services and custom, and proprietary and standard automated packaging machines; turn-key installation, automation, line integration, and packaging solutions; machinery solution that creates pouches; and pack temporary displays, as well as lithographic laminated packaging products. The Consumer Packaging segment manufactures and sells folding cartons that are used to package food, paper, beverages, dairy products, confectionery, health and beauty, and other household consumer products, as well as express mail packages for the overnight courier industry. It also offers inserts and labels, as well as rigid packaging and other printed packaging products, such as transaction cards, brochures, product literature, marketing materials, and grower tags, and plant stakes; and paperboard packaging for over-the-counter and prescription drugs. In addition, this segment manufactures and sells solid fiber and corrugated partitions, and die-cut paperboard components. The Global Paper segment manufactures containerboard, paperboard, and specialty grades primarily to corrugated packaging, folding carton, food service, liquid packaging, tobacco, and commercial print markets. The Distribution segment distributes corrugated packaging materials and other specialty packaging products, including stretch films, void fills, carton sealing tapes, and other specialty tapes; and provides contract packing services. The company is based in Atlanta, Georgia. As of July 5, 2024, WestRock Company operates as a subsidiary of Smurfit Kappa Group Plc.