Uzspace Hydration Tritan BPA-Free Sports Water Bottle Made of American BPA-free Eastman Tritan co-polyester Superior impact resistance, hydrolysis resistant, and antibacterial Narrow mouth and flip top lid design, to ensure leak-free and safty, and convenient to open and drink Marked with milliliters and ounces for easy measurement Excellent and very handy bottle for gyms, school, and outdoors.