I have never had a fireproof bag before so I wasn't sure what to expect but was pleasantly surpirsed when my ENGPOW bags arrived. They are well made and feel like high quality, I hope to never find out if they truly are fireproof but based on how the feel and look I am confident they will get the job done in a fire.
https://www.amazon.com/Fireproof-ENGPOW-Non-Itchy-Resistant-Documents/dp/B07D5T47GJ