Our everyday bottle for on-the-bike hydration. Versatile 550ml size and BPA-free construction. The SIGNATURE Water Bottle Black Series adds a flash of ASSOS styling to your hydration rituals with a 500ml size that also nestles securely into a jersey pocket for off-the-bike, hands-free transport or when youre on bottle duty. Wide mouth provides easy filling and a more receptive target for scoops of hydration mix powder. BPA-free.