http://www.fqpackaging.com/what-plastic-bags-are-the-safest.html Commonly used food plastic security deposit bags are mostly made of polyethylene film, which is non-toxic and can be used to hold food. There is another kind of film made of polyvinyl chloride, which is also non-toxic, but the additives added according to the purpose of the film are often harmful to the human body and have certain toxicity.