I'm traveling to Argentina for a few months with a few buddies for some backpacking and volunteer work and I was looking at The North Face Backtrack 50 Backpack. It's a 3050 cu in pack. I would like one with similar options and space, but $260 is just too much to spend. This will be my only bag. Any suggestions? Anybody recommend anything from experience?

I'd like to stay away from internal frame carry-all packs.

Thanks!