This is a very simple idea based on one that has already been implemented with a lot of success. Supermarkets can dictate consumers behaviour by limiting their options. At present supermarkets offer free of charge single use disposable plastic bags for customers purchasing fresh fruit and vegetables. If this option was withdrawn and replaced with a reusable drawstring mesh bag made from sustainable materials, that incurred a small charge but was a 'bag for life' then we could reduce the need for the disposable bags significantly. It would need the support of the supermarket chains to be successful but after implementing the '5p carrier bag charge' so triumphantly, I can't foresee that being a problem. I think major retailers can see that they are accountable for their actions and can also gain positive publicity for backing sustainable working practices that benefit all of mankind, and our planet.