High-Quality Vacuum Insulation: Both the inner and outer walls are made of food-grade 304 stainless steel, free from BPA, chemical toxins, and metallic odor. Long-Lasting Insulation: The double-walled vacuum insulated stainless steel container keeps drinks hot for up to 12 hours and cold for approximately 12 hours, effectively isolating external heat and cold and minimizing heat transfer. One-Hand Operation: This thermos features an innovative lock design; simply release the side button and press briefly for one-handed operation, making it ideal for travel and the office. Versatile Use: This stainless steel thermos is suitable for various occasions, including home, office, sports, driving, the beach, and even camping or hiking, making it ideal for storing water, tea, coffee, and carbonated drinks. Superior Design: Features a leak-proof lock design, ensuring a secure and leak-proof lid. The elegant curved body design is ergonomic, easy to disassemble, and easy to clean. Please note: 1. Due to differences in lighting and screen settings, the product color may differ slightly from the image. 2. Due to different manual measurement methods, there may be slight errors in size.