This is probably a very non-helpful reply, since I couldn't name a manufacturer or supplier for you, but would there be any food grade biodegradable plastics (I think they may be corn based? I've only seen them in eco friendly and compost garbage-bag format, so there may be all kinds of food-unfriendly toxicity involved.) The biodegradable factor is obviously a problem for the re usable bag idea, but maybe as a lining that could be replaced?
It's a great idea you have, I hope that you can source some material!























