Of course the somewhat simple alternative is to slightly change the consumer model, where you bring multi-purpose and longlasting packaging, they put the stuff in it. Dispensery type shops. That already exists in a few shops around Europe at least. You bring your container and fill it up with grain, liquids, whatever.

I can't really make up my mind on whether that would work for all food types. Maybe there's some heavily processed food that is dependent on being sealed until eating. I know potato chips bathe in nitrogen while sealed.