I use Cambro purchased from KAF. I have six in the bedroom for different types of flour. (Actually, in truth, one is currently repurposed for trehalose.) The smallest size KAF offers would easily hold 5 pounds of flour in the bag, though I dump my bags out into the container. Why make extra work?
Yes I know Cambro might be less expensive from other suppliers but Cambro makes so many products that I am afraid of ordering the wrong thing. The KAF Cambro flour buckets have lasted me twenty years, give or take, and they are still going strong. And they've never suffered an infestation.
Edit: from memory I think they are sized for 5, 10, or twenty pounds. Or something like that.