Your home is about to be incinerated, but you've been given enough time to evacuate everyone and fill a single container you have already with belongings to bring. What are you loading up, and what it

My home is itself a container. I choose that.

Into my largest suitcase: cash, medicine, important paperwork, yearbooks, favorite childhood stuffed animals, a week of everyday clothes, photo albums, every greeting card my husband has ever given me, as much makeup and nail polish as I can fit (shit's expensive!), phone, kindle, the watercolor I had commissioned of my dog who is no longer with us, and my box of yorkshire gold

I have a 40 for shipping container beside my house. I'm good.

My home is itself a container. I choose that.

My teddy bear that I still have, my black belt, my parents photos

Anything else I can burn

closet safe that has precocious metals and money in it.
the NAS
my one cat that doesn't constantly shit on the floor

Basic clothes, because it’s hard to find things that fit

My whole apartment. Joke's on you it's a shipping container!

^ Hiro Protagonist up in here.

OK, you know what, I declare my house the container. Now what?

The container with all your belongings is incinerated.

My towel

And your award for the fjords, I assume.
Now this is a frood who really knows where his towel is

You have reminded me to catalogue the collection

Consider making a list of everything you own, including brand and model. If you ever have a house fire, it’ll be the single most worthwhile thing you’ve ever done. There are entire companies dedicated to maximizing your insurance payout after a total loss; All they do is ensure you’re listing makes and models (or at least specs) for everything.
Insurance companies have gigantic lists of the absolute cheapest items on the market for common household items. If you list “toaster” on your insurance list, the insurance company will only pay out for the cheapest toaster on the market. The more specific your listing is, the less wiggle room they have to cheap out on you. That service will increase your payout by listing specifics. They change it from “toaster” to “pink retro-style four-slice toaster with bagel and defrost settings”, and your payout for that toaster goes from $3 to $280.

Can the container be the car? I've lived in my car before. Insurance paperwork (to hopefully be able to get $ for the destruction of the house), phone & chargers, IDs, all my underwear, a change of clothes. Work would probably let me park it in the garage while I was recovering from the loss, if I can keep the job, will land on my feet. If not, things quickly devolve.

This answer assumes the other residents of the house are all ok and not part of this scenario, and I only have to worry about me.

When we have had pending natural disaster, we bring clothes, kids & pets, have documents already in plastic bags, stow my car on second floor of work garage and fill coolers with ice, we have a protocol for hurricanes, but fire is a wildcard.

The bin of important documents. Everything else is replaceable. Pictures and data are backed up digitally. Clothes can be bought again. Family is already safe.

I mean it depends on how big the container is and whether or not my cat is included in "everyone". If not my cat then my PC and books

It's whatever you already have available to use, and I'd say anyone alive, be they human, cat, or alligator, is included in everyone.

Guns, cash, photos, safe contents.

Everything else is replaceable.

edit: I realize the guns are replaceable, but not like go to the corner store and buy same day replaceable. And I might need them.

If someone is burning your house down, it seems very likely you would have an immediate use for guns.
Can we just agree to let all the guns incinerate please
- Now is hardly the time to disarm.
- Hmm, why? I'm generally a pacifist, but I don't see us getting out of our current global predicament without some violence.