Drinking is vital and those that don't want to be out of water on a short ride must get the Zefal Magnum bottle. With 975l (33oz) capacity it can be mounted in all bottle cages and has a wide cap (65mm) opening. Features Capacity : 975ml / 33oz. Material : Polypropylene. Opening : screw-on - large opening 65mm Dia'. Dishwasher Safe. 100% Recyclable. BPA Free.