I always travel with two. One in the hotel safe in case I loose card number one. Also credit card companies have decided to red flag cards being used outside their home range. I had capital one call me at a Altanic city casino to check if it was actually me using the card. I call my credit card company a head of time now especially if I'm going some where casinos are. But I don't trust that they won't red flag my card. I have 3 major cards BTW.