You’re probably already aware that radio-frequency identification chips (RFID), which store and transmit unique customer data, can be found in many credit cards and ID cards, but did you know they’re also in all passports issued after October 2006? Marketers and high-tech identity thieves are constantly developing new ways to use this information. Protect yourself from both with an RFID-blocking passport holder ($18-$19) by DIFR Wear. Made with soft leather and a layer of RF shielding, you can block both unwanted advertising and cyberthieves.  DIFR Wear also offers an assortment of RFID-blocking wallets and badge holders.