We have some really nice THIN passport wallets I could dig out and hope there is a brand on them, but as others have said, get RFID blocking wallets if you can. Newer passports (issued starting last year??) have a little chip in them...think of it as a radio bar code. Supermarkets could put these things on all their products and you would just have to push your shopping cart through a lane and the total would be there, so no scanning of bar codes = quick turn around. But the fear, and why Walmarts of the world haven't implemented them on any great level, is that the RFID tag doesn't get taken off, so it could be tracked. Probably paranoia for purchased goods, but for your passport some say your personal information is being broadcast on that chip. I don't know if that is true or not, but why risk it. The BG would only have to have a radio receiver (and cracked whatever encryption if any is on the broadcasting RF chip in the passport) in close proximity (several feet?) to capture that info. Somewhat far fetched, but again, why risk it when simply blocked.
BTW, have you flown into Cancun before? if not I strongly suggest having your transfer to hotel/resort already taken care of and proceed immediately (after claiming baggages and hoping when you press the light switch you are not selected for a search LOL) to the OUTSIDE of the airport where all the transfers (Lomas Travel, American Express travel, etc.) are waiting. Inside the airport there will be people trying to grab your bags to 'help' you find your way..they expect a tip at best or at worst they may even claim to be your transfer when they are not and then stick you on one of their cabs/cars/busses and charge you for the ride. Just keep walking, don't even address them or answer them unless they try to grab your stuff, then just say "No" and keep walking. It isn't anything but a 30 second walk, and if you know what to expect it isn't a big deal. But newbies seem to struggle with it first time through. Just go outside, find a podium with a sign or somebody holding a sign for your pre-arranged transportation. BTW, returning to the airport is the same, when your transfer drops you off outside the airport say no to the porters and walk the 20 seconds into the airport and find your airline counter. Unless you have a lot of bags or something and want some help of course. They aren't as pushing leaving as they are coming.
