Rather than going down the rabbit hole of faraday bags, why not gain a better understanding of how you are being tracked every day so you can take steps to alleviate your concern?
Elsewhere you said you don’t want to be tracked going to the doctors office, but if you drive there your cars license plate is being read by dozens of traffic cameras. If you walk or take a bus there are most likely cameras which are accessible to law enforcement that can be used for computer vision if they don’t already do so automatically.
In the event that you drove, it’s likely that your cars wheel mounted sensors are emitting unique rf signals even if it’s infotainment system doesn’t have immediate connectivity (it definitely does and is tracking and reporting unique ids of devices near it).
The places you went before the doctors office are selling your purchase history (that’s why they give you a deal when you enter your phone number at checkout!), your voter registration information is freely available to any group that can register a political organization and if you paid property taxes then those records are publicly accessible and searchable.
WiFi can even be used, experimentally at this point, to pinpoint the physical location of people in a room based only on how their bodies interfere with the high frequency signal.
The point of this post is not to send you into a panic but to help broaden the scope of stuff you’re considering and maybe help you come to a more complete solution.