I swear by these for flour. My mom has some from 30 years ago that are still in use.

https://www.webstaurantstore.com/rubbermaid-fg631800clr-18-qt-clear-square-food-storage-container-with-liter-and-qt-gradations/690FG6318.html

Id recommend the 8 quart for all purpose or bread flour; it’ll hold a 12 pound bag (someday ill learn non-murican units for this purpose)

Not to mention copious drug usage, including date-rape drugs in drinks.