Finished this bag today and it turned out really nice. I love the closing mechanism and have been trying this sort of bag out myself for a while and I love it because it stays open when you want it and you can see what is inside. Also, it is very spacious.
This bag was made mainly of linen fabrics with some cotton parts. The inside is an easy to keep clean polyester fabric. There are 3 slip pockets, one front pocket under the closure tab and a vertical zipped pocket at the back. This enables you to open the zip, get out what you want and still keep the bag on your shoulder.
Here are the pictures: