San Francisco (where I live) and some other cities in the US have now banned plastic bags to some extent. Here, for example, grocery stores that sell over a certain amount in revenues cannot offer plastic bags. (They do have paper bags, many of which get doubled-up, but that's another story.) The program is now being expanded to include drugstores as well.
All of the shops now offer relatively cheap reusable bags however, usually selling for about a dollar. My favorite ones can be balled up into a little packet about the size of a fist, which fits easily in my backpack or purse so I use it all the time. Whole Foods sells one made from recycled plastic bottles.
Karl, with respect to your think globally, act locally post, well-said on all points!
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