Premium 350ml/450ml Stainless Steel Thermos with Double-Wall Vacuum Insulation. Commercial-grade 18/8 stainless steel interior resists rust and odors while maintaining beverage purity. Mirror-polished exterior features scratch-resistant brushed finish for professional aesthetics. Advanced copper layer between walls ensures 12-hour heat retention (hot/cold). Leak-proof swing lid with one-touch open mechanism and 360° sipping design. Ergonomic grip contour fits standard car cup holders and briefcases. Ideal for executive offices, business travel, construction sites, and outdoor adventures. FDA-approved food-safe materials, dishwasher-safe for commercial use. Wholesale bulk pricing available for corporate gifting and hospitality industries.