Featuring dual thickness 100% BPA free plastic construction and a cup shape design, Giant PourFast DualFlow Water Bottles have a very large screw top opening for easy filling and mixing. Includes the unique DualFlow valve allowing fast intake of fluids.Key Features: Material: Dual thickness 100% BPA-free plastic , Valve: Dualflow , Size: 600cc , Filling: Large screw top , Features: Cup shape design .