I have found this tutorial on luxquilt for a cosmetic bag. I thought about it for a few days, and couldn't wait anymore to start, and finish it.
The finish is very professional, thanks to the directions from Fernande. And so I am very pleased with the result.
But it is not a quick project, or maybe it would have been faster with less quilting and less interruptions.
The fiddly bit is sewing the second part of the zipper, as you have to find space for your machine foot.
At the end it looks clean inside and out, go and have a look at the tutorial.