I always go against the grain on this one. You have no experience with backpacks, you have no idea what features are important to you. No one on here can tell you. The high end packs are not the same. They all have their strengths and weaknesses. Go drop $800 on your first pack and confirmation bias will likely prevent you from getting the pack that is right for you.
Get a decent entry level pack and use it for a few years. Eberlestock, Badlands, Horn Hunter etc. contrary to what you'll be told here, you can actually pack animals, and weight, in something other than an $800 pack. You won't be damaged or injured doing so. It may suck but you don't know any different.
I'll let you in on some packing secrets, carrying 100# on your back sucks, I don't care what pack you are using. Most people aren't even capable of that in terrain and elevation. When you hear about X brand with "monster pack outs," they didn't weigh the pack. When 100$ feels like 70#, it's because you are carrying #70 not #100.
After some experience you will figure out the features that are important to you in a back pack. You can then sit down and make an informed decision on what will work for you. Once you figure out what you like, want and need in a back pack the decision will be easy as they are all different.
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