I'd like to put in another glowing word for ULA packs. The Catalyst in particular can handle load enough for you (if you carry more than 35 lbs for 1-3 days, please check out the "Lite Philosophies and Practices" forum <img src="/forums/images/graemlins/wink.gif" alt="" />), is plenty durable (check out Matt Hazley , ULA sponsored hiker), and Brian's customer service is amazing. The Catalyst has a two way belt adjustment allowing you to adjust the top tighter than the bottom, which I've found to be helpful to keep the felt from walking down. Also, at around 4500 ci total volume, it has enough space for up to 10 days provisions, depending on the trip.

OK, I'll shut up now, but I could go on and on about my pack.
Hike Arkansas!