I made a bag for myself because the ones for sale are either too big or too small... this one fits my notebook and pencils perfectly, and has some artwork by illustrator Barnaby Ward on the front, my design find of the moment...
The tricky part of making this was the piping (I couldn´t find the colour I wanted so I had to make it out of lining fabric and some spaghetti plastic tube), and the leatherette which was a pain to sew... but it was really worth it!