Place in a fire/water resistant bag 90% cash, 10% Bitcoin.
In the event of hyperinflation the Bitcoin will hopefully gain (or at least preserve value)-- and it can be transferred online, which the cash cannot. (And in the event of a total bitcoin collapse you still have 90%). Re-balance it once a year or so.
It doesn't take much to make missing out on the 0.5% interest rate of a high rate savings account into not much of a problem.
And bitcoin ATMs that spit out cash are becoming more common if you've been cut off from using traditional banking services and need physical cash, even if the spreads they offer are currently exorbitant.
In the event of hyperinflation the Bitcoin will hopefully gain (or at least preserve value)-- and it can be transferred online, which the cash cannot. (And in the event of a total bitcoin collapse you still have 90%). Re-balance it once a year or so.
It doesn't take much to make missing out on the 0.5% interest rate of a high rate savings account into not much of a problem.