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> My city banned single use plastics ages ago.

So what is the food from the supermarket packaged in? I assume mostly in single use plastics.

Not OP but increasingly cardboard with minimal plastic for lids or seals. Unfortunately few biodegradable products.

Cardboard is biodegradable, but not air/water tight. So not useful for most food. You would still need something like plastics.

Wax sealed cardboard is certainly viable. And regular cardboard is fine for fruit and vegetables.