First of all, here is my 3-season gear list for the AT. I am a section hiker and a warm sleeper. I am OK with this setup down to about 30 degrees or so, I think that is a reasonable definition of 3-season AT hiking.
Secondly, when I look at this list, it is painfully obvious that my pack (Exos 58) is massively oversized both in volume and weight for my gear. Basically, I made the mistake of upgrading the pack first, instead of upgrading / downsizing all of the bits that go into the pack, like all the BPL articles tell you to do. If your pack is 22% of your base weight, you have a problem.
I still am going to shed a tear when I have to pass the Exos along because I do love the suspension system. I was thinking about the shameless copy by z-packs that has an internal frame, but I guess just like it took me a while to move from tents to tarptents to tarps, I need to start moving towards a true frameless pack.
Mostly though beyond my dinosaur pack (that seemed cutting edge a year ago, starts to cry) what have I forgotten? Other ideas for shaving stuff? I still have a couple weeks before I hit the trail.
Oh, and expect to see an Exos 58, lightly used, on gear swap once the wise BPL folks steer me towards the right pack....