I crocheted a drawsting on the top of the bag to keep it closed. I think this is soooo cool! I googled it to see if anyone else had thought of this and I found one page where a lady crocheted some handles on a bag but I really like the drawstrings. They keep the produce in.
If you don't like to make things yourself the thrift store is a great place to find napkins. I got the ones on the top left for .25 each with 75% off so I paid about 6 cents each! Not only are these way less wasteful then paper napkins they are a money saver too! Always a plus!