Delivered what was promised and more.
Was dubious at first, even while packing, but eventually stuffed everything required for a 7-day trip in cool weather (which meant double-layer outfits) very comfortably.
Just a suggestion though: an optional daypack that can be strapped on to the normal bag would be a tremendous addition. That way it'll just be a slightly bigger bag when carried through the airport/while walking to the hotel/etc.
But on the plane, the daypack can store a book, headphones, and other in-seat essentials, plus can quickly be shoved under the seat, all while the normal bag is stored in the overhead compartment.