Mo. Rev. Stat. § 260.283: Paper or plastic bags, customers to have option, when — political subdivisions prohibited from imposing ban, fee, or tax on.

1. All merchants, itinerant vendors, and peddlers doing business in this state shall have the option to provide customers either a paper or a plastic bag for the packaging of any item or good purchased, provided such purchase is of a size and manner commensurate with the use of paper and plastic bags.

2. Notwithstanding any other provision of law, no political subdivision shall impose any ban, fee, or tax upon the use of either paper or plastic bags for packaging of any item or good purchased from a merchant, itinerant vendor, or peddler. No political subdivision shall prohibit a consumer from using a reusable bag for the packaging of any item or good purchased from a merchant, itinerant vendor, or peddler.