There is a source in my area for 55 gallon blue HDPE water barrels, and they are cheap. They are the style that has the two 3-4" bungs on top with the threaded plugs.
I want to skip the mylar bags and 5 gallon buckets and put dry goods directly into these with oxygen absorbers and seal them up. Specifically dried yellow corn, white rice, various sorts of dried beans.
Would this work? Is it safe for long term storage? They'll be going into a non-temp controlled area, the garage, will the swing from hot to cold damage them or compromise their seals?