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I'm getting a hang of paying with credit cards, and contactless payment especially, lately (which was quite uncommon where I live until like a few months ago). I'm now looking to buy one of these small credit card wallets because of the comfort and small profile, but also in order to get something with RFID safety.

I'm not really informed on how they actually work. However while searching for a good looking wallet online, I now read on multiple articles that people are complaining about the RFID system destroying their credit cards (the magnetic stripe).

I'm now concerned about whether really getting such a RFID safe wallet. Is it possible for systems like that to destroy your credit cards in such a way?

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Short answer. No.

Long answer. Nooooooo.

Longer answer. RFID typical work via magnetic coupling to both power and to transmit data. By modulating the load on the secondary coil of the magnetic couple (aka transformer), the RFID card is able to affect a back emf on the primary coil.

RFID proof wallets disrupt this by creating a Faraday cage (ie opaque box to RF) which prevents the magnetic coupling from occurring.

In order words it is literally a tinfoil hat.

Seriously. You can build your own RFID proof wallets by putting tinfoil in it.

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What can happen, and actually had happen, is that some card holder were badly designed and included a simple magnet for locking.

This will do nothing to the RFID part of the chip, but it can damage the magnetic strip that is used in some terminal (The ones where you slide the card and don't have to enter your pin code).

Note that this is not limited to "RFID safe" wallet, but can happen with any magnetic locking wallet if you get the strip to close to the magnet. This was also known to disable some bus ticket or other magnetic cards.

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