In fact, both are non-toxic:

Polyethylene and polypropylene are materials used for food packaging bags and are non-toxic.

Although polypropylene is non-toxic, plasticizers and color masterbatch have certain toxicity.

Non-toxic plastic bags are made of polyethylene, polypropylene and melamine and can be used to package food.

Plastic bags made of polyvinyl chloride are toxic and cannot be used as food packaging bags. The method to identify non-toxic plastic packaging bags is as follows: