I just purchased an Arc'teryx (however one really pronounces that) Altra 75 'Regular' torso length and in the color Raven. My North Face Badlands (all around good bag imo) was going to my younger brother. I needed a new bag immediately, so I was limited to the local markets.
I come from a military background, so durability is a must have. This will be my primary pack, and my only way to haul the possessions I'll use year round. I need at least 70 liters, and the ability to carry a sleeping pad. A hydration system is a must, as is a floating brain, the ability to hold walking sticks, a tripod, snowshoes, picks, climbing equipment, among anything else I may need to suddenly move with me (who knows) – and not necessarily all at once. I'm comfortable working with rope, so I don't mind tying things to the bag on my own. For this reason, and because the bag needs to be used in such a large variety of environments, I need something that doesn't have a myriad of laces, straps, exposed mesh and foam, and loops to get caught on things and tear. Lastly it has to accommodate my day pack, an REI Flash 18 (first generation).
This bag will brave peaks, snow, ice, mud, water, desert, jungle, and (of course) the airport.
A low frame height and shoulder straps are a must-have for comfort, my short torso, and the occasional squeeze into the overhead bin of a plane.
Because I needed a new bag immediately, I made my purchase regardless of the fact that I'm not yet sure if I even like the Arc'teryx Altra 75. The Baltoro (by Gregory, I believe, had an even lower frame and excellent back padding). While I'm a fan of the swiveling hip belt, adjustable shoulder straps, unassuming color scheme, and general build quality I must say there are some drawbacks. I don't like the fact that the stitching, on the few loops there are, is so small. Also, the hydration system placement appears to be a joke. Why on earth would anyone want what will most likely be the bulk of their weight off-center? In my eyes, the zipper not being waterproof, and the fact that the hip belt buckle is not the switchback (or however you call it) type makes this bag sub-par for one at this price point.
The one other bag that really caught my eye was the Mammut Heron 70. It's quite a bit cheaper than the Altra and seems to be a more well thought out design, more functional, and a better value. I don't know if the frame is taller, or not, than the Altra. I The problem is, getting my hands on one of these packs seems near impossible. Because of that, I don't know how the quality measures up. REI says they would have to special order one, and I can't find a store in all of the SF Bay Area that carries one. Having said that, I have personally dealt with Mammut, and they have superb customer service.
Now that you're all privy to where I stand, does anyone have experience with the Heron, or would you suggest another pack altogether? I'm all ears, and I'm even open to a custom bag (depending on whether or not I can buy anything for the price of the Altra).

