We've got reusable fabric shopping bags. Why not have something reusable that you can use in the bulk foods aisle?
I came up with this baggie a couple months ago, using fabric from the stash and π for possibly the first time since leaving school a million years ago. Since then, it's brought home walnuts, cornmeal, and granola. When it gets dusty inside, I throw it in the wash. The contrasting square is there so I can write in the bag's weight when empty, which would simplify the check-out process at the store. So far, PCC has been awesome about just taking a few ounces off the total weight, but they are probably undercharging me.
I can see making a bunch of these, some wider, some taller. I can't possibly use them all, though. I wonder if other people would want them?