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https://www.amazon.co.uk/gp/product/B01N33R89K/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
https://www.amazon.co.uk/s/ref=nb_sb_ss_i_3_10?url=search-alias=aps&field-keywords=credit+card+holder+rfid+blocking&sprefix=Credit+car,aps,160&crid=3HMRLRAK4D25E
and wallets that do it too
https://speakerimpedance.co.uk/?act=two_parallel&page=calculator
https://speakerimpedance.co.uk/?act=two_parallel&page=calculator
The way the tech works, is the reader energises the cards and transmits an ID code (I'd imagine this will be published somewhere online). As the card energises, it checks to see if the ID code matches it's programmed code, and if it matches, it's starts communicating with the reader. If it doesn't match, it doesn't respond. However as soon as a second card acknowledges the request and starts communicating, it disrupts the data flow and everything locks down, until the process is restarted (aka the card is removed from the reader, allowing it to deenergise, then be re-presented).
Contactless payment cards use the same ID, which is why you can have things like work access RFID cards in your wallet as well, and they'll still work, as at an access reader, the contactless payment cards won't respond, whereas the RFID card will. However if you were to put a colleagues RFID next to your own and try to get through an access point, they wouldn't work.
The videos I've seen from a couple sellers of faraday wallets, are simply using a reader that tells you it's had some kind of response from an RFID card. It's not actually reading anything from the cards, it's just simply detecting some kind of response. I've got an RFID reader that I could program to detect I've got cards in my wallet, but it wouldn't get any data from them unless I only presented a single card.
However, the other big thing is, contactless payment scams are a pretty rubbish way to steal money. Any fraud using a machine will simply be charged back to whoever used the machine, so you wouldn't gain anything other than some extra money sat in your payment processing account for a few days. From a criminals point, it's too traceable.
You'd be far better just physically stealing the card, and carrying out some contactless payments, to buy some untraceable goods.