The easy freeze bags have been designed to be used with all ardo pump sets and pumps including the manual amaryll manual pump pumps sold separatelyyou can express directly into the pre sterilised easy freeze where the expressed breastmilk is safe and no drop is lost due to the resealable fastening of the leak proof bags when you wish to use the milk the integrated heat indicator on the bag will show when the milk is warm for easy measuring each bag is graduated up to 180ml we use premiu