Here are the leading global manufacturers in the plastic packaging industry (companies widely regarded as the largest and most influential). I’ve listed each with a short note on scale or a recent, reliable source.

Top plastic-packaging manufacturers (global)

• Amcor — global leader in flexible and rigid plastic packaging; after announcing an $8.4B all‑stock deal to acquire Berry Global the combined business is positioned as the largest packaging player (combined revenues ~US$24B). (reuters.com)
• Berry Global — major producer of consumer plastic containers, films and engineered materials (was a top independent U.S. plastic‑packaging company prior to the Amcor deal). (en.wikipedia.org)
• Sealed Air — large U.S. packaging company known for Cryovac and Bubble Wrap, with multi‑billion dollar annual revenues and global operations. (en.wikipedia.org)
• ALPLA — Austria‑based global specialist in rigid plastic packaging (bottles, caps, preforms) with ~€4.9B sales and ~200 plants worldwide (2024). (en.wikipedia.org)
• Huhtamäki — Finland‑based packaging company prominent in foodservice and consumer packaging (global reach across fiber and plastic products). (See company annual reports and market rankings for revenue detail.)
• Sonoco — U.S. packaging company with a strong presence in rigid and flexible packaging and global operations.
• Plastipak Packaging — U.S. / global supplier of PET containers and thermoformed packaging, large capacity for bottles and preforms.
• Pactiv Evergreen / Novolex — major North American foodservice and consumer plastic packaging supplier (Pactiv Evergreen was acquired by Novolex in 2025). (en.wikipedia.org)

Notes and how I chose these:

• Rankings in plastic packaging are commonly based on annual revenue, product range (rigid, flexible, closures, films), global footprint, and recent M&A activity. The Amcor–Berry transaction notably reshaped the top of the list in 2024–2025. (reuters.com)
• Many regional or specialty firms (e.g., ALPLA for rigid bottles/caps, Plastipak for PET containers) are included because they are leaders in specific product categories. (en.wikipedia.org)

If you’d like:

• A ranked list by most recent annual revenues (I can fetch and compile 2023–2024/2025 revenues for the top 10), or
• A list filtered by product (rigid bottles, flexible films, closures) or by region (U.S., Europe, Asia).