The best backpack of my life, and I have many of them in my "collection". Everything about it is well thought out and comfortable. Today I used it on a bike for the first time in +23°C weather, and my back was not as sweaty as when using other cycling backpacks. The ventilation channel really does its job! I am very satisfied and delighted with buying this backpack, especially for such a price. The shoulder straps are soft, the material is stiff, and the backpack keeps its shape. I am most pleased with the number and functionality of the pockets, plus the straps for a carabiner or various other travel accessories. The 20L capacity is just right for walks in the city or short trekking trips. For me, it is important that it is very comfortable to ride a bike with it. It is best to buy it and check it yourself. I highly recommend it.