Excellent value for Money nice large size to match Checked Baggage (if purchased) 55cm x 40cm x 20cm
Lightweight waterproof and reasonable quality backed by a known brand.
Zips look sturdy and built to last overall very reasonable for a little over euro 40.00

It seems to be a product of quite good quality, with good zippers, sturdy straps, plenty of pockets/compartments, and large capacity. I bought it for one-day trips by intercity bus, for transporting sensitive painting items (tubes of paint, large sketchbooks, etc.), meaning things that I would not want in any case to go into the "trunk" of the buses. Of course, it can hold many other items as well, such as clothes (a cardigan, for example), but then the backpack will just fit into the storage spaces above the passengers' heads, which is where I want to place it exclusively for the safe transport of my items. However, this also depends on each bus. In some, it fits comfortably, in others, it does not. As for using it as a backpack, it is indeed quite bulky and "square" (not very aesthetically pleasing, that is) but it frees up your hands because before I bought it, I had to carry both a backpack and my hands full with bags, which was not convenient at all. Now I have everything in one and I am at ease. The only downside is that when I use city buses and want to sit in a seat, for example, I must take it off my back and hold it in front of me, which due to its large size is not convenient at all. Final conclusion: I am satisfied because apart from everything I mentioned, a cabin backpack with such capacity and quality of materials, at such a price, is impossible to find.

*It is waterproof (up to a point, of course), but without sealed (against water) zippers. So what good is it? A major flaw that I identified later. However, if they had put the right zippers, I believe the price would have gone up by at least twenty bucks.