Researching this it seems like PLA is also common. "Plastic" is a super vague term, and it seems like non-petroleum plastics are the norm for this application.

Researching this it seems like PLA is also common. "Plastic" is a super vague term, and it seems like non-petroleum plastics are the norm for this application. One benefit is that these types of plastics readily biodegrade into lactic acid (which naturally occurs in many foods). From a health standpoint it seems like they could be safer than some petroleum based plastics. Would be interested to learn more from someone who knows this area better. https://en.wikipedia.org/wiki/Polylactic_acid https://en.wikipedia.org/wiki/Polylactic_acid