I am a completely new to this scene. I plan to be doing a fair amount of hiking in the near future, for possibly up to maybe a week at a time. Right now I am shopping for bags. I have tested out the Gregory Baltoro 70, Osprey Aether 70, Deuter ACT Lite 65+10, and REI Mars 80. They all felt pretty similar to me from my limited use of them. Does anyone have any recommendations based on extensive use? Any pros or cons about these bags would be helpful. Thank you!