Design: Features a double-wall construction for insulation and a tea infuser for brewing loose-leaf tea. Material: Typically made from borosilicate glass, which is durable, BPA-free, and resistant to temperature changes. Features: Often includes an airtight lid, sometimes made of bamboo, and a stainless steel tea infuser filter. Usage: Suitable for both hot and cold beverages, ideal for enjoying tea on the go or during outdoor activities