I'm in the same boat. There are not many places around here to try on a pack. Your height should help narrow them down. When you really get serious about buying one I would have my torso length if I called manufacturers or dealers. It really seems like most backpacking gear is built around someone 5'9" and 150 lbs. You will probably want to pay attention to lengths of sleeping bags and tents also. Of all the seemingly overpriced backpacking gear out there your pack, tent, and sleep system are about the easiest places to save weight. That said if your pack is hunting your body and you are cold or wet a couple extra pounds would be worth staying warm dry and comfy.