The HSF Aerodrink 880 follows in the footsteps of the Aerodrink with updated features.CAPACITY: 880ml (30oz),FLIP CAP: Easy no spill refill port,BAR MOUNT: Uses standard BTA bracket for no fuss secure mounting to aerobars,DESIGN: Improved no-leak cap makes this system a real winner when it comes to reducing the stress of hydrating in competition,VALUE ADDED: Control your fluid intake with a hygenic bite valve on your drink system,VERSATILE: Mount the straw front or rear depending on your reach and preference,AERODYNAMIC: Improved 880ml shape is designed to improve airflow onto the frame and reduce drag.