Rigid plastic bottle (the BPA free label is indicated on the bottom, a guarantee of quality without risk to health), very convenient to be reused every day.
It is equipped with a graduated scale that reminds to drink at least the amount of water indicated at any time.
Once finished, it should be filled and re-drank all (1 liter + 1 liter) to cover the daily requirement.
Both the cap to fill it and the one to drink are equipped with a rubber seal that prevents the accidental escape of water during transport.