I went to Europe when my baby was 6 weeks old too. I basically pumped and threw because I can't find any method to make frozen milk and i dare not to take risk. I go to business trip every week now to China. I can bring back all the milk I pump there. But need to calculate very accurate and plan ahead. I asked hotel concierge to froze the milk and I use fridge-to-go. I gave up for long-haul.