Torhans Aero 20 Hydration System Water Bottle 20oz: Black Features a high aspect ratio, airfoil design from bottom to top of the Aero mast BPA free Includes: - 20oz Aero bottle (650ml) - AeroFlow straw housing and straw - XFlow fill-on-the-go Mounting system sold separately (WB0303) Features a high aspect ratio, airfoil design from bottom to top of the Aero mast