I've been using a faraday bag for my phone everyday for over the last year. I can say it can still be used if you download the content first and you have a pair of wired earphones/headphones. The cell connections will be blocked and you'll still be able to consume content. There are also bags that have a small opening to access the screen. Altough I think this defeats the purpose of the farday cage. 

 but, at this point, just use a old thinkpad and take out all the antennas and the wifi card... just use a device that is not designed to track 

 I agree, but the thinkerpad is probably more combersome. I can go anywhere with my faraday bag (wich fits in my pocket)