If you've not been through the exercise of packing a Bug Out Bag, you might be unpleasantly surprised as to how impractical PMs can be.
So you're saying that in an end of the world scenario where no monetary instrument has value at all and the skies are covered in radioactive clouds and you're leaving all your belongings and vehicles behind at your house that it's inconvenient to carry a million dollars worth of physical metals in your pocket while attempting to run away from the hypersonic nuclear missiles? Okay.
That 45 pounds of shiny metals is gonna slow you down quite considerably when trying to 'run away from the hypersonic nuclear missiles'. I'd allocate some of that weight to food, water, and 5.56.