Backpack Market Size, Share & Industry Analysis, By Product Type (Daily Commute, Travel, Business/Work, School/College, Sports & Fitness, Outdoor Adventure, Fashion/Lifestyle, and Others), By Price Range (Economy (below USD 50), Mid-Range (USD 50-150), Premium (USD 150-300), and Luxury (above USD 300)), By End-user (Men, Women, Unisex, and Kids), By Distribution Channel (Specialty Outdoor & Sports Stores, Supermarkets & Hypermarkets, Department Stores, Exclusive Brand Stores, Online/E-Commerce, and Others), and Regional Forecast, 2026-2034