REI Garage offers the Pacsafe RFIDsafe RFID-Blocking Travel Organizer in Rosemary for $31.73. Opt for in-store pickup to dodge the $5.99 shipping fee. That's the lowest price we could find by $6. It features a detachable strap, mesh passport holder, and multiple zippered compartments. It claims to block out most transmissions between 10MHz and 3GHz.