Our bottle has a specially marked filling line to help avoid excess water flowing into the spill tray during carbonation.
The capacity of the bottle up to the filling line is 27oz or 800 ml and this is how much water can be carbonated at once. The capacity of the whole bottle equals approximately one liter.
The capacity of the Small PET Water Bottle up to the filling line is 15.2 oz or 450 ml and this is how much water can be carbonated at once. The capacity of the whole bottle equals 21.9 oz or 650 ml.