About This Item Premium 304 Stainless Steel – Made from durable, food-grade stainless steel that is rust-resistant and safe for daily use. Double-Layer Vacuum Insulation – Keeps drinks hot or cold for hours while preventing condensation on the outside. Portable 400ML Capacity – Ideal size for office, school, travel, or daily hydration. Leak-Proof Sealed Lid – Secure lid prevents spills, perfect for carrying in bags or backpacks. Versatile Drinkware – Suitable for coffee, tea, milk, juice, or water. Sleek & Practical Design – Comfortable grip and stylish look for students, office workers, or travelers. Perfect Gift Idea – Great gift for friends, family, students, or coworkers who enjoy portable drinkware.