Love that bag! This gal has published other books on bags and totes and all her books are in her native language but the diagrams are very helpful and there are the actual patterns in the books. She is very creative in her bag making. I really like the soft colors she uses too. Bet you could find the book on Amazon if you knew the title.
Here is a link that will take you to a slide show of the book. If you click on any of the pics, they will go full screen. No patterns but there are diagrams. The bag you are looking at is close to the end of the slideshow.
accessories.gallery.ru/watch?a=bmdP-fiz&subpanel=film
Hope this works.