The Trek recently published data on pack usage on the AT. The article covers the top brands, capacity, and base weights, and offers some interesting points. To begin with, the most popular pack is hands-down Osprey (44%). Gregory came in at 3%. Base weight, the weight of your pack without water and food, was a function of the type of hiker with the section hiker average around 20 pounds while through hikers came in around 17 pounds. This is instructive for our club members. I think our averages are significantly higher than these.