What does everyone tend to do? We are about to invest in some new cases and don't want to make a bad decision, we have a 1 year old and a newborn due and I'm not sure what's best to do with regards to luggage when flying abroad, I know every airline is different so will need to check this out but do you tend to find it's better to combine their luggage allowance into your cases (in this case we would get a bigger size case however I'm aware whilst you can pool luggage allowance each bag has a limit) or do you take 2 adult cases for the hold and then the kids a case each in the hold with their allowance in?