Corrugated Handle Box Market Size & Forecasts 2026-2035, By Segments (Design Type, Material Type, Application, End Use Industry), Growth Opportunities, Innovation Landscape, Regulatory Shifts, Strategic Regional Insights (U.S., Japan, China, South Korea, UK, Germany, France), and Competitive Dynamics (International Paper, WestRock, Smurfit Kappa, DS Smith, Packaging Corporation of America)