There is a very large library of sewing tutorials at SewLover Arts School. The entire site is interesting and there are more than 50 patterns just in the bags section. Other sections include toys, patchwork, and items for the home. The site is in Chinese but Google Chrome does a very good job of automatic translation. I was even able to say thank you through the message tab at the bottom of the page.
One of my favorite patterns is for this sweet little case.