Is it necessary, or even a smart idea, to purchase a RFID blocking sleeve for my passport/credit card when carrying them in my waist pack?
RFID sleeves are a solution looking for a problem. A complete waste of money.
I have no idea if they are necessary, but when I got my last Easy Pass it included an RFID blocking sleeve at no additional cost. If you have an Easy Pass or similar you might be able to get a blocking sleeve for free and use it if it provides peace of mind.
It is market hype. Use it if it is free 'cause it cannot do any harm.
Just so you know, RFID refers to the technology that allows some cards to be read without contact. Some gas pump cards do it, just wave it in front of the sensor and it registers. My CTA transit card uses it. Standard credit cards do not. ATM cards do not. Passports do not. And even for the cards that do use RFID, you have to place it within inches of the scanner; so anyone trying to scan your card would have to do it inches from your wallet.
The RFID blocking sleeve for EZPass is not hype. It is provided so that you can put your EZPass transponder in the sleeve and it will not register when you go through a toll booth. In my case I use it for certain bridge toll booths that overcharge me when using EZPass and I am driving my motor home. I pay cash instead. The normal toll roads are okay. There may be other reasons you do not want to be recorded as going through a particular toll booth.
I visited the thread linked in the first post. Apparently if there is a risk with these cards ridicule and intolerance mitigates the risk substantially.
The portions of the statement above concerning reading distance and contained data applies only to passport cards. In fact, it is entirely incorrect as it pertains to currently issued booklet passports. passports. It has no applicability to the old, non-chip passports.
Passports with the chip can only be read when opened near the gizmo and contain all personal data printed in the passport book as well as the access code to the governmental database. It also contains a copy of the photograph. The passport covers incorporate RFID shields, hence the passport must be opened to be read.