A Faraday bag is a special enclosure which blocks electromagnetic fields from passing through it.
Since radio waves are a form of electromagnetic fields, radio-frequency communication (RFID) is also blocked. RFID tags are widely used in credit cards, passports, and countless devices.
The bag exploits an electrical phenomenon described in 1836 by English scientist Michael Faraday. He found that a hollow, conductive structure distributes electrostatic charges evenly across its exterior, which effectively prevents the signal from passing through. These structures are also called Faraday cages.
This bag features several layers of metallic fabric which forms a built-in Faraday cage.
Once you know about this simple principle, you may start noticing Faraday cages everywhere. Microwave ovens, elevators, and even rocket launchpads are examples of Faraday cages. Even laboratories and medical imaging rooms are built as Faraday cages to shield sensitive readings from outside interference.
Dimensions: 6" wide x 8" tall
Features: Adjustable shoulder strap, 5 separate compartments, headphone wire port, 5 credit card slots, pen slot, velcro flap, padded backside