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Faraday bags

Fortunately, convenient and cheap with tasty contents!

https://arstechnica.com/information-technology/2017/11/austr...

According to that article, it looks like the bags have to be grounded to work:

"Snack packets are made with a foil that combines aluminum and mylar plastic, making them electrically conductive and ideal as a temporary electromagnetic shield for mobile devices—as long as the packet is closed and grounded—and you don't mind a few crumbs on your device."

I'm not sure if that's really true, or why that is... and if it is, how one could do it while on the move.

Yeah, my understanding of the faraday cage property is that it equalizes the charge across the surface.

Whether that charge is equal to ground or not is irrelevant I thought.

I will make the sacrifice tonight and eat a packet of chips for testing I guess. It is a hard life.

If it's not grounded charge will accumulate on the exterior walls but I doubt it will be significant for a cellphone.

No need. There's a real off mode.

How do you invoke the real off mode?

My googling hasn't brought me the answer here. How do you do this?

A hammer, perhaps?

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