Here is a run-down of all the popular backpacks on the Pacific Crest Trail (PCT). Also included are a couple pack comparison charts for you, looking at a range of the most common and reasonable packs for normal people. I hope this helps your selection. Please correct any mistakes or omissions in the comments below.
Here is a list of packs that would fall in the expected range seen on average PCT thru-hikers. One sees these being carried happily and successfully on trail, every day.