Tin foil hats aren't enough anymore.

[Shuto]

link

The wallets contain a layer of RF shielding that prevents RFID readers from reading any passive tags stored within

Seems like a smart idea to me.

 

[BrandiJo]

Sounds like a good idea, my pass port has one of the new chip thingys in it too (not sure what its for but meh) it might be useful to know that nothing else is reading it while i dont want it read
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[Shuto]

They have passport protectors as well.

I wonder if aluminum foil would work.