I bought the RFID wallet and an RFID pouch to keep my chipped passport, id cards and drivers licence secure, more than for holding cash (cos the wife wont let mehave cash) It stops security scanners reading my private data. In the UK its not just the authorities scanning your data as you travel many large companies, chain stores, marketing companies etc try to harvest your data as you enter malls or offices or liesure facilities in order to target you with marketing rubbish. But if it makes it that tiny bit harder for the spooks to track me then I'm content.