Go buy a set of Tupperware. Yes they are plastic, but the set I have I got from my Mother. She bought it back in the 1970s. And one of my Grand kids will still be using them after me and Grandma are long gone. That's a pretty good use of plastic.
The large one I have will hold 5lbs of flour without issue, the next size down will hold 3lbs of sugar easily, then next size smaller yet a bag of brown sugar. Now my Grandmother, she bought flour by the 20lbs bag. And she had a wooden box in her pantry that she stored the whole bag in. She baked a LOT of bread and other baked goods nearly every day.
There's a thing where I am where you can buy stuff in bulk by going to the front till and weighing the container and writing the weight of the empty container on the bottom so you just directly fill your stuff. They usually are independent eco grocery stores but they are pretty awesome. Probably not up to filling 50lbs at a shot but good for your regular home baker.