Osprey - Talon Pro 40 - Walking backpack

One of the best backpacks I've ever carried, it has everything you need, both for mountaineering and photography. I use a water system from Tulle, a professional backpack, with which the weight can be easily transferred to the pelvis below or to the shoulders depending on the desire, the adjustment of the back is also important. I'm glad I chose this model, although I wanted to buy a 35l, but all models under 40l did not have these functions as the models from 40 to 60l. I also have Orthovox, Saleva, Patagonia, and before that other Deuter models, for now this is the best!
For me, the main parameters of a backpack are the following;
1. The top lid should be removable - so that you can put on a jacket, luggage, etc. if necessary
2. Option to adjust the height of the back - this relieves the load and achieves more comfort when carrying, adapts to any back and load.
3. Enough options for attaching poles, ice axes, tripods, ropes and more on the outside.
4. Lightweight and well protected from water ingress.
5. Possibility to move the weight low down to relieve the load on the shoulders and back, by tightening the belt and loosening the straps - it is disassembled beforehand with well-arranged luggage - heavier things from below.