This is the Tatanne Bag, made with the pattern found in http://thesisterof.blogspot.com/p/pattern.html
So far, it is the trickiest and most expensive bag I've ever made, and it took me a while to finish it. It is totally worth it, though. It's big and spacious, and has a kind of professional look. I love it, though I don't think I'll be making another one any time soon.