【Durable and Healthy Materials】Our flip-lid water bottle features a food-grade 304 (18/8) stainless steel inner wall and a BPA-free PP plastic lid. The lid has a removable silicone stopper and sealing ring to ensure a tight seal. The bottle body is made of environmentally friendly coated stainless steel, providing a beautiful color, rust resistance, durability, and greater longevity than glass. 【Vacuum Insulated Travel Mug】This double-walled stainless steel thermos uses vacuum welding technology to reduce heat conduction and slow down temperature changes, keeping drinks hot or cold for 6 to 10 hours. Enjoy perfectly chilled beverages even during long workdays or travels. 【Lightweight and Leak-Proof】A capacity of 451 ml is available. Compact and portable, it can be easily opened and closed with one hand. The lid's button has a locking mechanism to enhance leak prevention and prevent accidental opening in handbags or backpacks. 【Versatile Use】This quick-drink water bottle is suitable for brewing coffee, tea, and milk, and can also be used to store lemonade, iced water, etc. Whether you are traveling, working, studying, at home, exercising, or outdoor camping, it is the perfect companion for your daily use. [Perfect Gift] This coffee container is also an excellent gift choice, such as a birthday gift, Mother's Day gift, retirement gift, etc.