Identity theft is a constant concern in the digital age, and the inclusion of RFID chips in just about everything from cell phones to passports unfortunately opens up another avenue for would-be thieves to lift your data. The only way to really know you were secure would be to block all wireless frequencies from reaching your IDs and gadgets. ThinkGeek's solution is the Blokket, a small pouch designed to hold mobile devices or RFID-chipped IDs and block them from receiving any incoming wireless signals.
