Last time I went to DefCon, the SLNT Bags were petty popular. I didn't buy one myself so I can't speak to their effectiveness, but if the DefCon crowd trusts them I think they're probably at least worth looking into.
this post was submitted on 04 Jun 2025
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I am not sure if I would trust a company that claims a glorified fanny pack will protect your health from EMF radiation.
Any chip packet (you know, like a Doritos packet) , or your fridge. Try a chip packet in the fridge, that should stop it.
Haven't tried the microwave, but maybe that's an option too.
I saw a speaker at Black Hat once break down some big failures in international espionage, and one instance he cited was CIA agents thinking they could use a Doritos bag as a Faraday cage.
Works depending on how you do it, how many bags you use, where you are, and what the signal stength is.
https://www.youtube.com/watch?v=iin-fCsltfE
Enough chip packets will block anything.
Sure, but if someone is looking for recommendations for "faraday bags that work", I wouldn't recommend "any chip bag" if it needs to be qualified with "it depends on a lot factors". I'd just recommend an actual faraday bag whose intended purpose is to block a signal.
Yeah, but the problem with that is that they don't get to eat any potato chips.
Anyways, today's use case for the person's post is to block a garage door beeper, so chip packets or a refrigerator should do fine.
...unless they're also abducting people for extraordinary rendition. Then maybe get the faraday bag.
I agree the OP's use case isn't life-or-death and therefore doesn't need the highest quality faraday bag, but they asked for ones that work, so I felt it pertinent to point out that "any chip bag" was not, in my view, a particularly good recommendation. It's cheap and accessible, but isn't going to work as well (or at all) compared to a bag that was designed to block signals.
In this instance, you get what you pay for. OP is free to try the chip bag method, but they ought not be surprised if it's an insufficient solution.
What are you trying to accomplish? Prevent RFID tags in a wallet from being read?
Ah, you know, just throw a device in that communicates anywhere from 40 KHz to 40 GHz so that it never communicates until I take it out.
Keep my garage fob from going off, fuck with googlemaps, the works.
You can buy fabric that has metal threads, which works like a faraday cage and put it in a sock or whatever. TitanRF for example.
If you want a diy and cheap option.
I got like a whole square foot for 10 or 20$ years ago and it works like a charm.