I was able to purchase some of these containers for $2 each about 8 years ago. I'm not sure exactly where they came from, because I belonged to a sort of Co-op. We would purchase our dry foods in bulk. One lady would source these food grade storage containers and we would have a "Sealing Saturday where we would seal up our flour/wheat/rice/sugar etc together into foil pouches with oxygen absorbers, and seal them up with an Impulse Heat (foot pedal operated) Sealing Machine. Of course we all donned hair nets, gloves and aprons for hygiene reasons. Was a lot of fun :D
This is an example of the food grade bins we were able to purchase.
Mylar bags fitting nice and snug filled with rice and perfectly fine. Sealed August 2003.
You want to make sure the insides of these are very clean so you don't get nasty things growing inside while they're stored away. The outside can get as dirty as it likes, so long as the lids do their job.