After I made the Blue floral messenger purse, I wanted a zip pocket inside (to keep my check book and other important papers) so made this flat purse which is lined with a dark blue twill fabric to give it strength. Dimensions and some instructions below.
I cut the fabric 10" x 8" but that makes the purse fairly long. For a more standard size, cut the fabric 10" x 6".
I didn't use this video but this is the basic method of sewing a lined purse.