The lewis N clark RFID neck stash pouch is ideal protection for your passports, currency and credit cards and prevents those items with a RFID chip from being read when closed a must for today's long lines at airport check-ins and border crossing. All newly issued u.s. Passports and many credit cards now include RFID chip (radio frequency identification data) that store personal information about you. Criminals can use rfid readers to steal your important personal information to access your documents and accounts. The RFID block passport holds and effectively blocks readers for security. Built in ID window makes this travel wallet easy to use while negotiating tsa security.