When traveling, we more and more rely on debit and credit cards to pay for things and get money from ATM’s. All is good when things work. When something starts going south it is good to have back up plans in place.
Over the years I have had my wallet lost, card(s) deactivated due to merchant database compromises, Visa/MasterCard authorization systems not working etc. These are all manageable when you have alternative plans in place.