The drinking spout and body are made of PCT resin, a BPA-free material that ensures transparency, heat resistance, and impact strength. With an attached filter, you can conveniently carry your preferred cold brew tea or fruit-infused tea. It allows you to take your favorite beverages, cold brew tea, or flavored water on the go. Thanks to the built-in filter, it can also be used as a matcha shaker. The interior of the drinking spout is equipped with a filter mesh.