If you use food grade buckets I do not use the Mylar bags. Rice, beans, grains, pasta. I do not use the bags only the bucks with the O2 Absorber.
Now I sometimes use the smaller Mylar bags and put five to ten bags in the bucks. You need to use the O2 absorber in the Mylar bag then seal the bag with heating iron. If you have any other question you can pm me. I do this all the time.