Please allow me to relay a bit of old-man nerdery today: Look to the Bankers Box.

When my mom died, and we had to move my dad out of his home of 50 years, I was tasked with salvaging as much of their documents, photos, and keepsakes as possible.

I'm gonna buy some paper boxes immediately. This article has just persuaded me to not care about plastic boxes anymore (another hobby of mine).

UPD. Bankers Boxes do not exist here, and the available paper boxes do not really seem standardized... Convoluted.