Taking a good drinking bottle on your ride with you ensures quicker, more efficient hydration and better performance. The majority of cycling water bottles are made of polyethylene (PE) - a tasteless and food safe plastic - and designed with a similar diameter so they all fit into the same bottle holder. Depending on their size they hold about 400 - 1000 ml. So, if you're tempted by an aluminium or hard plastic cycling bottle instead make sure your choice will fit into most common bottle holder models first.