[sargun]

Ah! You’d be glad to know that “we” know how to do this. Films are an area that a ton of people have poured time into.

Two that I know that’d fit the bill well are Zein (corn) and Chitosan (Crustaceans, Mushrooms, although now we can make it in bioreactors). There are extensive studies on them, and there are a bunch of folks who have invested time in building food packaging out of them (although, maybe not in the way you’re thinking).

As far as I can tell, these materials can be made suitable with enough engineering to meet the task at hand. They are more expensive than current solutions, and perhaps the engineering would need to be studied more closely for safety, but what you’re suggesting doesn’t seem entirely crazy.