Prohibiting, on or after July 1, 2021, a certain retail establishment from distributing plastic carryout bags to a customer at the point of sale; providing that, on or after July 1, 2021, only the State may enact a law or take other action to prohibit, restrict, or regulate the use of certain plastic bags by a retail establishment, that certain authority of a county or municipality is preempted, and that certain laws or ordinances are superseded; requiring the Maryland Department of Labor to adopt certain regulations; etc.