Stainless Steel Vacuum Flask Set 500ml/16.9oz Insulated Thermal Mug Keeps Drinks Hot Cold Bonus Cup for Business School Office Use

• 【Five-Layer Insulation Technology】 This cup features advanced five-layer insulation construction to maintain beverage temperature for hours. The layers consist of a frosted exterior, 201 stainless steel reinforcement, a vacuum insulation barrier, an outer copper-plated lining, and a 304 stainless steel inner wall—ensuring optimal heat and cold retention. • 【Three Interchangeable Lids】 Included are three versatile replacement lids, each equipped with a removable handle for convenient drinking. All lids feature a secure screw-on design with silicone sealing to prevent leaks and accommodate different usage preferences. • 【500ml Large Capacity】 With a generous 500ml volume, this cup is perfectly sized for a variety of hot and cold beverages. It reduces the need for frequent refills, making it suitable for daily commutes, workouts, or extended outdoor activities. • 【Secure Leak-Proof Seal】 Designed with a reliable silicone sealing ring and a tightly threaded lid, this cup effectively prevents spills and leakage. It is ideal for carrying in bags, using during travel, or enjoying at home without concern for mess. • 【Elegant and Durable Design】 Combining sleek modern aesthetics with robust stainless steel construction, this cup offers both style and longevity. Its refined appearance and functional details make it an excellent gift choice for everyday use or special occasions.