Give spare electronics Faraday protection

A properly sealed conductive Faraday bag can reduce electromagnetic energy reaching a spare phone, radio, or drive—the same shielding idea used for key-fob…

A properly sealed conductive Faraday bag can reduce electromagnetic energy reaching a spare phone, radio, or drive—the same shielding idea used for key-fob pouches. Choose a product rated for the threat you care about, keep backups unplugged, and test the pouch by checking that cellular, Wi-Fi, and radio signals stop.

Why a spare only counts if it is protected

A backup phone or radio is useful only if it still works after the event you prepared for. Strong electromagnetic pulses and even everyday static or signal exposure are reasons people store spares shielded, unplugged, and sealed. A Faraday bag works like a metal cage in cloth form: its conductive layers spread energy around the contents instead of through them. The catch is that gaps, worn seals, and untested bags can quietly defeat the whole idea.

What to do, step by step

1. Choose spares worth protecting: a basic phone, a radio, and a drive with documents and maps.
2. Charge devices, update their contents, then power them down fully before sealing them away.
3. Place each item in its bag, fold or seal the closure exactly as the maker directs.
4. Test the seal: a phone inside should miss calls and lose cellular, Wi-Fi, and Bluetooth signals.
5. Store the sealed kit cool, dry, and unplugged, and retest it whenever you refresh the contents.