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I don't understand the comment from the Texan about not being able to use canvas bags for larger purchases. I carry about six Whole Foods canvas bags in my car, and I just load them up. Each one holds about the same amount as three plastic bags (which are invariably double-bagged). I love marching into Dominick's or Jewel with my Whole Foods bags, because screw them for failing to have their own canvas bags for sale at the checkout.
Though I have to say, while I feel a private sense of victory from making the checkout people bag my groceries in a competitor's bags, my little environmental statement always goes wholly unnoticed. That's why I'm glad to see sustained coverage of this topic in the media this year -- thank you. Little by little, maybe we can clue some people in.
You can buy some reusable bags (and get freaked out by the plastic bag-ometer) here: http://www.reusablebags.com/store/
I recently saw the premiere of Trashed, a pretty effective documentary about our failure to deal with our trash epidemic. Check it out: www.trashedmovie.com