How are you dealing with pet food?

I buy a few kilos of dog biscuits at a time and at the moment we keep them in the bag in the garage, and decant enough for a week into a plastic kitchen tub. I’m worried about rats attacking what’s in the garage, so I suspect I want some kind of hard plastic tub, but I’m concerned about it being too big and awkward to easily get out the week’s food. Has anyone else got this solved?