Wow! That Jansport new is around $275. That's as big and as expencive as the Osprey. Must be a really nice pack!

My brother has an Aether 65, It's very sturdy, comfy to wear, slim lined, and holds a ton. But organization isn't very good. If people look at Kelty and Alps external frame packs, they can be found for $100 to $150. Jansport though, seems to be a Premium pack, with a premium price!
I really like External frame packs. Partly because of the Retro look, partly because they are somewhat modular and partly because I can get them and replacement parts on the cheap. I have three External frame packs, a Medium Alice, American Camper and a Blackhawk SOF Ruck Pack Kit. They work for me. Have tried and used a few Internal frame packs, they were comfy, and worked well. But they didn't have the Charactor or the old school appeal to me that an External frame pack has.
All 3 of my External frame packs have been upgraded to Military Surplus Molle II kidney pads. Even though, I have a Water bladder and am thinking of buying another one, I love using my Canteens. The Molle II kidney pad lets me mount a Canteen on one hip and misc stuff on the other. The Alice and Blackhawk packs have loops for tools which I really like. Most of the time, I have a Machete or Khukri on the pack, though somes, I'll slide a 3/4 axe into the loops. . . My American Camper, has no loops for lashing an axe or poles to the pack. Might have to sew some webbing straps to it in a few places. I like having a Machete/Khukri or Axe with me on most of my trips.