Trying to get a credit card reader to register a worn magnetic strip on a credit card at the check out line can be a fiasco. And you know it’s time to spend fifteen minutes getting a new card when when the cashier wraps your card in a plastic grocery bag to try and make it work.
That’s a cool trick, but I think the best way to never have this problem is to never have this problem.
So, store them front-to-front in your wallet, instead of front to back. This will help isolate the stripes—and isolate someone reaching for a shopping bag to get you through checkout.