I think they are addressing your question. The refinement, which you agree to, is at least evident in the top closure of the bag which is something not often seen in the load/volume/weight category of similar products. This perhaps is not definitively refining, but in the sense that is is removing the unwanted larger roll-top closure alone, and aiding it with a pullover - well, it is a nice add-on. And not the only nice aspect of the bag.
The innovation would be that it is a German-made product, something very appealing to those of us not living in the center of our Universe, USA.
It can be difficult in Germany to start-up a cottage industry business venture, that sells globally, so for Laufbursche to put its/his products out, certainly by numbers alone proving a competitive product with MLD, SMD, and so forth, he allows the Europeans a lower priced alternative to products of similar quality.
This is a major innovation.