You're taking your reusable grocery bags to the store, right? But what do you do with your produce? I confess that I still use those plastic produce bags for a lot of my produce--way too many of them. I admire the people who just throw their produce into their carts or right into their reusable grocery bags. I'm sure that that is the right thing to do, but, as a bit of a germophobe, I can't quite get myself to do this with all of my fruits and vegetables. And sometimes it is just more practical to use a bag when I am buying many pieces of a certain item.
However, I have committed to kicking the plastic bag habit, thereby eliminating the waste as well as another instance in which our food comes into contact with plastic. That's why I am ordering reusable cotton bags to use at the store. I found two sources with both organic and non-organic cotton options. I've ordered many items from Reuseit.com and have been very happy with their service and the products I've received. The site has this selection of reusable produce bags. Ecobags also has a good selection of cotton produce bags. Of course, it would also be a big improvement to simply bring plastic produce bags back to the store and reuse them.
Finally, here is a great guide from the Berkley Farmers' Markets on how to store fruits and vegetables without plastic.