I see your flower bags and I raise you bacon packaging.

What, paper bags? Not that big a deal, just ziplock out or stuff it in a sealable plastic container. I'm guessing @ArtLesbO there didn't grow up in the Midwest lol

People leave it in the paper bags? What a bad idea lol.

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.

9 times out of 10 all that flour on the outside of your bag of flour is not your bag leaking it's because one bag in the palette busted open and got on all the other ones. When you get home, you either transfer the flour into an airtight reusable container, or put the bag inside a 2 gallon zip lock and seal that.

Boxes leak more. And plastic with make it mold if there's any amount of water in it.

Baking pro tip for shopping: buy some buckets. 3 gallon is plenty big enough for a grocery store sized bag.

Get the cart to your car, put the buckets (one for each bag of flour) in the buggy and transfer the bag/s into them.

Then move the buckets into your car. They'll be less messy, protect the paper bags better, and make carrying it in easier via the handles.

If you're a high volume home baker, it's still easier than dealing with ordering in bulk.