Ok, I have tried to ask a lot of questions but have had no responses. I am going to hike the AT May 2008. I am researching for all the gear that I will need for this life time journey. I am looking for the right backpack. I currently own a Camelback which I use on day hikes. I hike long distance but never have carried tents, etc. I always hike back to where I camp. Please help me in my decision on purchasing the right pack to carry tent, sleeping, etc. I need to have light weight because I have a bad back. Any suggestions would be greatly appreciated. Thank you.