It's not clear the reusables have done that in any significant way. Indirect measures suggest that plastic bag production has remained relatively steady.
Not every reusable bag is environmentally equal. A nonwoven polypropylene bag, for example, would have to be used just 11 times to make up for the negative effects of a plastic bag used one time, according to a British Environment Agency study that compared bags. A cotton bag, however, would have to be used 131 times.
Reusable bags have taken on such cachet that a just-released book celebrates them as an art form. The Tote Bag, by the British designer Jitesh Patel, even has a jacket that doubles as a reusable bag
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