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.

Amcor plc develops, produces, and sells packaging products in Europe, North America, Latin America, and the Asia Pacific. The company operates in two segments, Flexibles and Rigid Packaging. The Flexibles segment offers flexible and film packaging products in the food and beverage, medical and pharmaceutical, fresh produce, snack food, personal care, and other industries. The Rigid Packaging segment provides rigid containers for various beverage and food products, including carbonated soft drinks, water, juices, sports drinks, milk-based beverages, spirits and beer, sauces, dressings, spreads, and personal care items; and plastic caps for various applications. It sells its products through its direct sales force. The company was incorporated in 1926 and is headquartered in Zurich, Switzerland.

Crown Holdings, Inc., together with its subsidiaries, engages in the packaging business in the United States and internationally. It operates through Americas Beverage, European Beverage, Asia Pacific, and Transit Packaging segments. The company manufactures and sells recyclable aluminum beverage cans and ends, glass bottles, steel crowns, aluminum caps, non-beverage cans, and aerosol cans and closures. It also provides manual, semi-automatic, and automatic equipment and tools to apply and remove consumables, such as straps and films; protective solutions, including airbags, edge protectors, and honeycomb products; and steel and plastic consumables include steel strap, plastic strap, industrial film, and other related products. The company serves food industries, including pet food, personal care, household, and industrial products. Crown Holdings, Inc. was founded in 1892 and is headquartered in Yardley, Pennsylvania.

Silgan Holdings Inc., together with its subsidiaries, manufactures and sells rigid packaging solutions for consumer goods products in the United States and internationally. It operates through three segments: Dispensing and Specialty Closures, Metal Containers, and Custom Containers. The Dispensing and Specialty Closures segment offers a range of metal and plastic closures, and dispensing systems for food, beverage, health care, garden, home, personal care, beauty products, and hard surface cleaning products, as well as capping/sealing equipment and detection systems. The Metal Containers segment manufactures and sells steel and aluminum containers for food products, such as pet food, vegetables, soups, proteins, fruits, and other miscellaneous food products, as well as general line metal containers primarily for chemicals. The Custom Containers segment manufactures and sells custom designed and stock plastic containers for use in personal care and health care; food and beverage; household and industrial chemical; pharmaceutical; pet food and care; agricultural; automotive. This segment also provides thermoformed barrier and non-barrier bowls, and trays for food products, such as soups, other ready-to-eat meals, and pet food products; and plastic closures, caps, sifters, and fitments, as well as thermoformed tubs for food, household, and personal care products. The company markets its products primarily through direct sales force, as well as through a network of distributors, and an online shopping catalog. The company was founded in 1987 and is headquartered in Stamford, Connecticut.

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.

Enpro Inc. design, develops, manufactures, and markets proprietary, value-added products and solutions to safeguard critical environments in the United States, Europe, and internationally. It operates through two segments, Sealing Technologies and Advanced Surface Technologies. The Sealing Technologies segment offers single-use hygienic seals, tubing, components and assemblies; metallic, non-metallic, and composite material gaskets; dynamic seals; compression packing; hydraulic components; expansion joints; and wall penetration products for chemical and petrochemical processing, pulp and paper processing, nuclear energy, hydrogen, natural gas, food and biopharmaceutical processing, primary metal manufacturing, mining, water and waste treatment, commercial vehicle, aerospace, medical, filtration, and semiconductor fabrication industries. The Advanced Surface Technologies segment offers cleaning, coating, testing, refurbishment, and verification services for critical components and assemblies used in semiconductor manufacturing equipment, as well as for critical applications in the space, aerospace, and defense markets; and specialized optical filters and thin-film coatings for various applications in the industrial technology, life sciences, and semiconductor markets. The company was formerly known as EnPro Industries, Inc. and changed its name to Enpro Inc. in December 2023. Enpro Inc. was incorporated in 2002 and is headquartered in Charlotte, North Carolina.

Ranpak Holdings Corp., together with its subsidiaries, provides product protection solutions and end-of-line automation solutions for e-commerce and industrial supply chains in North America, Europe, and Asia. The company offers protective packaging solutions, such as void-fill protective systems that convert paper to fill empty spaces in secondary packages and protect objects under the FillPak brand; cushioning protective systems, which convert paper into cushioning pads under the PadPak brand; and wrapping protective systems that create pads or paper mesh to wrap and protect fragile items, as well as to line boxes and provide separation when shipping various objects under the WrapPak, Geami, and ReadyRoll brands, as well as cold chain products, which are used to provide insulation for goods. It also offers end-of-line packaging automation products, which help end users automate the void filling and box closure processes after product packing is complete. The company sells its products to end users primarily through a distributor network, and directly to select end-users. Ranpak Holdings Corp. was founded in 1972 and is headquartered in Concord Township, Ohio.

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.