I am pleased to see some UK supermarkets are phasing out plastic bags. Here in NZ, they are still used , but there is encouragement and increasing social pressure not to... and to buy the supermarket re-useable ones. And they are certainly nice and cheap at 99c each. But I often seem to leave them either at home or in the car. And my kids give me a hard time for using my willow basket or string bags (too much association with the 'granny' image).
But this is a neat idea. Little bags that roll up like socks. Nice colours too. And washable so you can get the potato-soil out. Flip & Tumble.