The satisfaction I have from this specific flask cannot be described. Firstly, I consider it a necessary tool for hikers. I imagine it serves equally well for other hobbies, but I don't have an opinion on that.
Very practical construction and easy to clean. Its mouthpiece works with the classic bite and it even has a protective cap. It is designed to be placed correctly in the back position of the backpack. There, I dare to say, although it is not a thermos, the water remains cool. If it is put in a thermos, then the user achieves the desired temperature.
Beautiful and elegant construction.

I recommend washing it before the first use, to remove any industrial residue and plastic smell. It performs perfectly during a 6-hour climb.

The product already comes with the upgraded helix nozzle valve, which costs an additional 15€ to purchase. Due to the intermediate membrane, the bag maintains a low profile, making it ideal for the back. So, for the excellent quality and relatively low price, I am fully satisfied.