How do you manage the logistics for traveling on 8hrs to Sydney when you are pumping exclusively (perhaps need to pump at least once) and baby takes only ebm? Is beast milk allowed on hand carry at Australian custom?

Maybe pump using freemies at ur seat? Go toilet put it on and then pump at ur seat then go toilet to remove it then come back ur seat to transfer the milk? Because toilet ain't the most hygienic place but if u are at the window seat or u can do it discreetly at ur seat then I guess it's ok?