Remember, to comfortably carry a lightweight pack, because of the limited suspension and support, you have to make sure you also lighten up ALL of your gear, especially your tent and sleeping bag.
My favorite is the ULA packs. They are made of Dyneema, have generous hip belt pockets, and do not have any extra zip pockets or hoods, just large mesh pockets on the outside. It really forced me to be organized, so I can carry less stuff (the essentials), and access all of my small stuff without opening the poack, or even takling it off.
My favorite is the
ULA Conduit. Although both the Catalyst and Circuit are great lightweight packs that still have a frame. I used a Fusion (pre-Circuit) for two years before I switched to the frameless Conduit.
Here is the Conduit set up at 29 pounds for a 4-day solo trip.
"If there are no dogs in Heaven, then when I die I want to go where they went."
- Will Rogers