Made of durable HDPE plastic, the Nalgene 32 oz. HDPE Narrow Mouth Bottle comes includes an attached loop top cap. Perfect for storing water and BPA free. . Made of sturdy, reliable, economical HDPE plastic. Comes with a loop top cap that won't get lost. Liquid measurements in ounces and milliliters lets you keep track of your hydration. Dishwasher safe top rack only remove cap. Withstands temperatures from 100AdegC 148AdegF to 120AdegC 248AdegF. Round for easy storage and for use with pack bottle holders. Holds 32 oz.. Made in the U.S.A..