The Sylhet City Corporation (SCC) gave its residents and traders seven days to stop the sale and use of polythene bags.
In a press release, SCC said the incumbent government has taken various initiatives to make the country free of polythene bags.
It requested all traders and people to shun polythene bags and warned of legal actions.
In 2002, Bangladesh banned thin polythene, becoming the first country in the world to do so. But polythene bags are still widely used thanks to a lax implementation.