The classic stainless steel interior is both BPA & lead free, and will not leave a metallic taste in your mouth. The double walled interior also provides a sweat proof exterior to avoid any messy condensation if carried in a book bag or briefcase. The leak proof lid has a simple flip lid for easy on-the-go drinking and a wide grip handle to carry around. Want to keep you hands free? This tea infusion flask is the perfect size to fit most cupholders in vehicles, bicycles and backpacks.