I use a Gregory Acadia. It was made for EMS, but I've seen a few sold elsewhere. Holds a nice load for section hiking(which is what I am currently). I bought it 2 years ago and it's still like new, with 400+ miles on it. I've always been a big fan of Gregory, but am beginning to look more at lighter gear. The only advice I could add to the great post's so far is watch how many cubic inches you get. If you go with too big a pack, you might be tempted to overpack. Happy hiking!