I have found the perfect rucksack yet, although the Lowe Alpine Contour Crossbow 50 is pretty good. I have found that the crossbow system makes for a very stable load system when scrambling over rocky terrain. Perhaps a pack which can take additional PLCE zipped side pockets such as the Karrimor Sabre 45 combined with the contour cross bow system from Lowe Alpine with the back system from a Berghaus Freeflow Pro using lightweight and tough dyneema ripstop fabric would be getting there.

Another problem is that when you find a pack you really, really like and you need a replacement it is generally not available a few years/decade later. This also it seems applies to other things such as boots.