Premium 40oz stainless steel tumbler with double-wall vacuum insulation for 24-hour temperature retention. Leak-proof flip lid with foldable straw ensures spill-free use while driving, hiking, or at the office. FDA-approved food-grade 18/8 stainless steel interior resists odors and stains. Ergonomic grip design with sweat-proof copper coating maintains comfortable hold. Custom engraving-ready brushed finish on exterior surface. Commercial-grade powder coating prevents scratches and fading. Wide mouth opening accommodates ice cubes and easy cleaning. Ideal for outdoor adventures, gym sessions, and daily commutes. BPA-free construction with dishwasher-safe components. Bulk purchase discounts available for corporate gifts and event promotions.