Tea infuser bottle, likely made of stainless steel and designed to keep beverages hot or cold. The text on the bottle, which reads "轻便标 小身材,大容量 FACTE," translates to "Lightweight, small size, large capacity FACTE," highlighting its portability and volume. Tea infusers are used to brew loose-leaf tea by allowing water to flow through the leaves, extracting flavor and nutrients. They are reusable and often preferred for their ability to let tea leaves expand fully, resulting in a more flavorful brew.