1. World's first, Taiwanese-made tumbler with a double-cap tea strainer 2. The patented double-cap tea strainer automatically filters tea leaves, preventing them from entering your mouth. 3. Patented pressure-release bottle cap design makes it more convenient to use while driving. 4. Made of PC baby bottle material, it is lightweight, shatterproof, heat-resistant up to +130°C, and highly transparent. The thermal cover made of diving suit material prevents burns and provides cold insulation. 5. Can be used to brew flower tea, herbal tea, fruit tea, coffee, various tea leaves, tea bags, etc. It's the perfect companion for work, study, travel, mountain climbing, camping, and more. You can always make healthy drinks! I received this as a souvenir from Taiwan. Unused. It's a very popular bottle. 370ml size, 18cm The perfect size for a bag. Feel free to ask questions or negotiate!