https://www.mattblaze.org/blog/faraday/
Other test: Putting Faraday shielding fabric to the test.
Reliable tools for the modern paranoid.
If you guys know other Faraday bags that was tested (not from manufacture) and blocked signals efficiently, please share.
Michael Bazzell uses one from Silent Pocket called Output.
I dont know how through he tested those though but if I will buy one, I’d probably try that first.
any metalic box is a faraday cage, you don’t need to buy a fancy bag.
You can got one from a dollar store. Farayday cage is not about computer or electronic, is about Physic (electromagnetic branch)
This company sells a lot of “faraday” products that are just… completely open on the top? Seems like a scam company basically.
No they have a seal and works. I have bought a few from them just for fun. I didn’t need them but I needed travel bags for some devices and I thought it was funny with signal blocking. 
I think faraday bags is a meme or for people with a really niche threat models.