Sorry, I'm sure this has been addressed before but perhaps I'm not looking for right search terms. I tried "packing list", "packing essentials", and others and I'm just not getting what I'm looking for. What I need is some help packing my and my 12-yr old son's carry-ons for a flight from LA to Sydney. Now, I can figure out the obvious (lens case, tissues, etc.) but any advice about useful things to include (to survive this looooong flight) would be GREATLY appreciated!