I used to work for Ron Burkle who owned a bunch of different grocery store chains. He used to tell me that the difference between a supermarket being profitable or not could come down to whether the customers choose paper or plastic and the big No No that costs them way too much was double-bagging.
I have been getting more tea at Starbucks lately and I have noticed that they always give it to me in two cups. I guess its hot so they don't want me to burn my pretty little fingers but isn't that what those jackets are for? Why would they be using two cups. Cost them more. Bad for the environment.
Note to self. Design new disposable cup that doesn't require double cupping or the jacket over the cup and still doesn't get too hot