Bento Boxes Market Size, Share, and Industry Analysis By Material (Stainless Steel, Plastic, Glass, Wood, and Others), By Closure Type (Clip, Buckle, Snap, Drawstring, Hook & Loop, Magnetic, and Others), By Level of Insulation (Fully Insulated, Non-insulated, and Partially Insulated), By End User (Kids and Adults), By Distribution Channel (Online/E-commerce and Offline), and Regional Forecast, 2026-2034