The debate has long raged over which is the correct choice of grocery-toting receptacle. Recently these stupid bags were invented and have promised to answer the prayers of hippies everywhere:
So now you can spend money you don't have to and obnoxiously announce you are to good to just reuse regular bags at the same time! But this is still not the best answer:
Paper or plastic? Neither. SLAVES
Think about it. A slave can carry much more than one of these bags. And while it takes a regular plastic bag 1000 years to biodegrade, slaves biodegrade in only a few years. Or you can even feed them to other slaves. Now THAT is sustainability.