Here’s some invaluable additions to my Travelling at 60+ post, with grateful thanks to Helen from Dordogne!
Mints or some sort of sweets when flying
Dried fruit (a dried banana is invaluable, lasts for years too!)
Sea bands (instead of, or as well as, Travel sickness pills)
Driving Licence (in Europe you can use it as identity, which saves handing over your invaluable passport)