I stand firmly on team "let's set the rules first, and if you can't figure out how to stay in business too bad". That's where ubi would be great - we can't keep worrying about jobs with the changes that need to happen
But the main difficulty is flexible and light water/airtight containers. Plastic is amazing at it - even paper or aluminum almost always uses plastic lining. There are other options, but they're generally inferior and hard to scale - stuff like
Additionally, these things might need to last for months or years in storage, often in humid environments - anything biodegradable is going to have problems
But again, we're all being poisoned by this. I think they should be phased out with extreme aggression - if we all have to go back to dried or very fresh goods, so be it - it would probably be healthier. With such a huge incentive, the technology would get there pretty quick.