Then they should ban the sale of sandwich bags or any plastic container bags like Ziploc and Saram. Why isn't there more effort to promote not littering in our parks and beaches...? Wouldn't that be more effective instead of punishing the majority of people who are responsible with their trash? Heck, if the city wants to increase revenue, have patrols to hand out tickets to violators of the parks ordinance and fine them... People will think twice before leaving without taking care of their waste...