![Signal Blocking Bag, ONEVER [2 Pack] GPS RFID Faraday Bag Shield Cage Pouch Wallet Phone Case for Cell Phone Privacy Protecti](https://images-na.ssl-images-amazon.com/images/I/71qEa9j+S5L._AC_UL160_SR160,160_.jpg)
I own two of these and a Mission Darkness bag of the same size. These kill the signal for at least two cell phones placed in them (three would probably be too big for the bag.)
I've tested these on cards that contain RFID chips (like employer badges & RFID cards for Arduino projects.) They scan as well as if they were in a paper bag.
Consumer, be advised: Signal-isolating containers such as these are not a "one-size-fits all frequencies" solution. The frequencies of radiation that any container like this attenuates is limited.
Know what you want to have protected and choose your solution accordingly.
A fairly expensive "RFID-blocking" wallet I bought a while back proved to be mostly useless with respect to its claims.
If you have access to a reader, be it at the store, at your work, or even at home, try it for yourself. Don't just take my word for it.
I still value this bag for its functionality with cell phones, but try not to believe that this is a bag that blocks everything in the ranges it so broadly claims to.
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