As far as hiking goes, I was for a long time an avid user of Osprey backpacks + Osprey hydration bladders.
I have however come to realise that I now have come prefer the UL-style packs with the two large side pockets in which I can place water bottles. It was using the LiteAF 46lt full suspension pack that has driven this transition.
So much so that I am now thinking of getting a smaller pack around 30lt for multi-day hikes where stoves, tents and sleeping bags are not required.
This is also leading to the point where I am considering selling off some of my Osprey packs. (I still a big fan of Osprey though and will continue to use some of their other products).
I do like looking into UL packs where I can order customised as much as possible. This is not a cheap option, but neither are Osprey packs. If I'm going to spend money like that, it surely is better to have something that is customised to me.
The one thing that niggles is that using a UL-style pack does not really work for the occasional snow hike. Bottles on the outside will freeze. UL packs are not really meant for carrying skis and snowshoes.
