personally, i'm with California on this one.
our society has become so wasteful. We use these reusable cloth bags...
...but occasionally forget to bring them when we make unexpected stops at the stores.
most of the stuff in my home is reusable, I have even been known to remove the labels from glass jars and bottles, clean them thoroughly and use them as drinking glasses.
not only that but i remember an article i read that claimed that something on the order of several million barrels of oil go into plastic bag manufacturing.
think about it, we use a precious resource to manufacture something that will be used all of 10 minutes, then relegated to the dump by most people - there it will sit pretty much forever.