Hi all, my family and I (myself, husband and 2 kids 6 & 10) are travelling to Europe in July this year. We will be doing most of our commuting between countries via train. We want to pack as light as possible, but obviously with 2 kids this may be a little difficult. Sorry if it's a silly question, but what would be the largest recommended size suitcases to take onboard? I was thinking two 28 inch suitcases and a backpack each for me and my husband and a smaller backpack for each of the kids. Any recommendations appreciated. Thank you.