While browsing at Joann Fabrics recently, I ran across some really inexpensive 100% olefin fabric for shopping bags. It came in nice prints so I thought I would try making my own shopping bags. I patterned the bag after a "store-bought" bag which I use often because I like the size and shape. The instructions for the coupon holder are available at Joann.com. The fabric was easy to sew and I like the finished product. I haven't used it yet so I don't know if it will hold up for heavy items but certainly will for cereal, bread, etc.
I used bias binding to encase the raw edges. It added a nice finishing detail and made the bag more sturdy.