Whatever one you decide to use ~ you might think about lining your pouch with aluminum foil. There are so many people out there willing to steal your info with their fancy scanner machines. Don't make it easy for them..I either watch too many detective shows or I am just getting paranoid these days..either way..its better to be safe than sorry.
I found a little metal pouch at Target to put your credit cards in and such. I think it was less than $5..in the travel accessories.