And finally done. At the end, the decision was between a Thule Paramount and a GotBag Pro Pack. I ended up ordering a Thule Paramount: https://www.thule.com/en-us/backpacks/laptop-backpacks/thule-paramount-backpack-27l-_-3205014 Main reason was that Thule also offered a rain protection cover, while GotBag didn't, and I tend to get rather wet during my commute in sad regularity.