Traveling with kids is tiring yet rewarding. With a bit of planning and foresight, you can minimize the angst that most of the parents experience while traveling with baby / kids. First and foremost is the first aid or safety kit! I carry all of the items mentioned below, packed inside a zip-lock pouch. That is in case there is some leak due to any reason (say air pressure etc), zip-lock bags can easily be replaced. That said, I carry disposable zip-lock bags in varied sizes for all my travel. Its an utterly versatile piece of package.