I think he means to store the bulk of the cash on your own, and it wouldn't be inconsistent to store a couple thousand in a bank to access the usual banking inf

I think he means to store the bulk of the cash on your own, and it wouldn't be inconsistent to store a couple thousand in a bank to access the usual banking infrastructure. If you wanted to avoid even that amount of storage, you can also use them primarily for borrow money(credit cards, loans, mortgages, etc.) and pay the debts back with cash. I can access borrowed money through my bank's online interface.