The only negative thing about it is that the zipper is on the sides. It was my only concern and it was confirmed in the end. Other than that, it is the best thing I have bought in terms of size, price, and ease of transportation.

Very good quality materials and strong seams. Thick and sturdy zippers that do not get stuck and withstand rough handling. The main compartment opens along the sides of the backpack, allowing easy access to most of your belongings.
The space it offers is large and comfortable. It has strong straps to tighten the load internally, as well as straps that allow you to attach items to the outside of the backpack. I filled it with a 17 kg load and carried it on my back in very difficult, rocky terrain (through a river) and it held up well in terms of durability and abuse.
It also includes a waterproof cover with an elastic band that "hugs" the backpack and protects the contents from rain.
The downside is the comfort. The title is "Hiking Backpack" but I would not recommend it for hiking or trekking over one kilometer. The back panel, although made of breathable material, is not comfortable at all. There are no panels that create a gap between the body and the backpack, so you start sweating within minutes. The shoulder straps, although wide, start to "cut" and hurt after a while.
Overall, it is very good for its price and for relaxed outings with little walking and light weight. For anything more demanding, there are other more expensive backpacks with proper support that are much more comfortable.

After thorough research on backpack purchases, I ended up with this one.
49 euros for 60 liters of storage is, in my opinion, a very good value for money in terms of price and capacity.
I really like that both color options, black and khaki, have a solid color without phosphorescent letters, reflective elements, or colored cords.
An interesting positive aspect is its versatility. Whether as a backpack or a shoulder bag, it is beautiful and practical.
Another advantage is the included hood. In most backpacks, this is an additional purchase with a cost of 10-25€.
And one last but very important thing is the large and sturdy zippers. A detail that makes a difference for those familiar with the "sport".
In any case, it is a honest purchase. The definition of VFM (Value For Money) and maybe even more.