These are the supplies needed to make one. I used a heavy interfacing and fusible fleece along with a 1/2 yard each of tan linen fabric and a pretty cotton print I found at JoAnn's. Of course you need thread and a sewing machine. I didn't have a pattern but I had a small notebook that I used to design my pattern around.
This is what it looks like closed. The ribbon came from Cris at Mommy's Midwest Mountain Folk Art Studio (visit her blog here http://mommysmidwestmountain.blogspot.com/ )when I bought an adorable kitty angel from her off ebay. I also used a vintage pearl button from my stash to loop the ribbon around for a closure.
This is so much cooler than carrying around my stuff in a grocery sack. :)