...assuming they get reused. If you're the forgetful person who buys bags every time, using reusable bags is probably worse than the environment. That's why banning bags aren't the right approach. Impose a surcharge/tax/minimum price on the bags. If you're not going to remember to bring reusable bags when single use bags cost 50 cents each, you're probably not going to remember to bring reusable bags when single use bags are banned and all you can buy are 50 cent reusable bags.