I am a big fan of using reusable grocery bags. I love not having a cabinet full of wasteful plastic bags, and the majority of those which do make their way into my apartment do end up in the recycle bin. Not that I don't dispute the usefulness of plastic or a plastic bag--my garbage can is currently lined with one, thank the sweet Jesus. Plus plastic bags are still used by pet owners clean up after their adorable, spoiled little ones.
What gets at me sometimes is how I don't get the tiny 10 cent discount at the grocery store UNLESS I am using a fancy reusable shopping bag. It seems that I can't imply that my messenger bag is sufficient to carry groceries, AND it had been made abundantly clear that agreeing to carry my groceries (or even a single, simple item) by hand and not in a plastic bag does not constitute deserving a 10 cent bag discount. I just think the discount should apply to anyone who chooses not using another stupid plastic bag.