We just used the freezer bags and froze in smaller amounts, great for when DS was going through a growth spurt and needed a top up. From memory you couldnt reuse the frozen milk once thawed out, so it would be wasted if not used right then. Maybe someone could confirm that?

I was also told the milk could only be mixed together if it was within 24 hrs. We only washed with hot soapy water after each pump, but once a day would boil all the equipment, it was stored in an air tight container in the fridge when not in use. We were told by the SCN not to store empty bottles with the lids on them, cant remember why, just that we should store thebottles and the lids seperate, but in an air tight container. HTH