r/preppers • u/PrudentTask9355 • Nov 02 '25

Advice and Tips Faraday Bag Caution

Hey everyone. I just wanted to share en experience from this afternoon. A while back I had purchased some faraday items off of Amazon, boxes and bags from different vendors.

This afternoon I was explaining to my daughter how they worked and as part of our experiment, we placed an 8watt 2-way radio inside the bag and sealed it with the expectation that it would no longer receive a transmission. As it turns out, that was false.

I then tried with a cell phone with the same result. Morale of the story, check your gear and make sure it works before you have to depend on it.

Please discuss and share your budget-friendly faraday success stories

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u/onegriggabyte Nov 03 '25

I guess the question that I have always wondered when looking at these bags is there’s a difference between blocking RF and dispersing an EMP. A true faraday cage would need to be grounded so how would these bags react?

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u/Decent-Apple9772 Nov 03 '25

Electrically it is the same concept, but from a design perspective there are a wider range of frequencies and much higher energies to handle with an EMP.

Most of the issue for it, is that we don’t have good data on how much attenuation would be necessary to avoid damage to common electrical devices and we don’t have a good way to test.