Yep, internal frame. As far as colors go I'm not picky, anything from OD Green to camo; makes no difference.
I considered an ALICE pack, but they make too much noise when coming in contact with brush, etc.
I looked at the HPG pack, I have previous experience with them. A fine product and great customer service.
I really like the Mystery Ranch DragonSlayer, the Nomad was nice, but I liked the DragonSlayer.