Global Paper Packaging Market Size, Share & Demand Report By Product Type (Corrugated Packaging, Folding Cartons, Flexible Paper Packaging, Molded Fiber Packaging, Coated & Specialty Paper Packaging), By Material Type (Virgin Paper, Recycled Fiber, Kraft Paper, Specialty Paper Grades), By Application (Food & Beverage, E-commerce & Retail, Industrial Packaging, Healthcare & Pharmaceutical, Personal Care & Cosmetics), By Distribution Channel (B2B Direct Sales, Distributors & Wholesalers, Online Procurement Platforms, Direct Supply Contracts) & By Region Forecasts, 2026–2031