I didn't make this tutorial, but it's really cool!
http://www.craftster.org/forum/index.php?topic=45906.0
Also, I'm in progress of making this bag. I'll post pictures when I'm done :]
http://www.craftster.org/forum/index.php?topic=2684.0
For a tutorial on how to attach magnetic snaps for the bag, go here.
http://www.craftster.org/forum/index.php?topic=60281.0