Gold will work, of course, as a Store of Value as long as you do not have to board the plane with it.
US resident citizens can always choose platinum if worried about the TSA upon exit or a general gold confiscation (unlikely IMO, but possible). Silver of course would be free of that confiscation threat, but it is bulky.
Or saffron? (Worth more than its weight in gold I have read)
Sorry I think this is ill informed advice. Any thing of value will be confiscated at transportation hubs, borders, checkpoints, routine inspections by police, etc..
And I am not convinced it will hold its value.
Either we move too far into a Dark Age, and gold loses its value relative to food. Remember Armstrong has explained why this happens throughout history of man.
Or we move to the Knowledge Age and gold loses its value relative to the crypto currency I am creating.
Or maybe both!