[E. Pluribus Unum]

You can use a a Mylar potato chip bag as a Faraday cage for your phone and your smart keys:

https://arstechnica.com/information-technology/2017/11/australian-man-uses-snack-bags-as-faraday-cage-to-block-tracking-by-employer/

[RushIsMyTeddyBear]

Bkmrk.

[Redbob]

"You can use a a metallized Mylar potato chip bag as a Faraday cage for your phone and your smart keys:"

There, fixed.