But my point remains the same. If a fireproof safe doesn't actually protect from fire....don't bother with a fireproof safe.
Here is how I view this. Do powerful "natural & unnatural" events happen that could instantly impact your ability to quickly recover?? Instant tornado, instant dam rupture, & resulting instant flood. Instant, zero warning massive firestorm, and a dozen other types of events.
Because of where and how I have lived the last 50+ years I have rejected the "bugout" maneuver as not relevant to me. Slowly, likely because of aging I have slowly started accepting the possibility.
Now I could keep important papers and documents in any container, Grocery bag, pillowcase, wood box, a $400.00 leather attaché case, but "NOT" in a vacuum bottle.
The safe can contain many-many things NOT critical to starting over, they are nice things but not critical. Things like firearms, 110 years of family photos, other personal treasures.
I want to have, what I need to start over all-in-one container. It is not like I reside in an urban or suburban or rural area to start my bug'out. I am in the center of the second largest National Forest in America (near seven million acres of wilderness). I would just need to get to a safe place to continue life, and I would not (likely to) be getting there on foot.
I see "zero" disadvantage to said container having some degree of fire "resistant", so long as the combined weight of both the container and contents is manageable. I have a "PELICUN" Camera Case, that is the same size maybe slightly bigger, it is stronger built, and would work also.