The Vevor Faraday Bag 4-pack set is designed to block signals from phones, tablets, laptops, radios, and other electronic devices for added privacy and anti-theft protection. It helps prevent tracking, hacking, and signal relay attacks by blocking Wi-Fi, Bluetooth, GPS, RFID, phone signals, and 5G networks. Built from fiberglass and nickel-copper RFID material, these pouches are also heat-resistant and spill-resistant for added durability. The set includes multiple pouch sizes for organizing and protecting a range of devices and valuables. Foldable construction with secure Velcro closures makes them easy to carry and use during travel, work, or daily storage.