I didn't read the whole list, but after the disaster of either Princess losing, or someone taking, either accidentally or on purpose, my husbands suitcase, I bought some large neon green straps to put around our luggage--cheap at Walmart and at least makes it much more difficult for someone to take a bag by accident.
We don't bring much of the other things, mostly a medical kit in case--which we have used on occasion and of course international plugs, if needed.