760cso wrote an answer about Arc'teryx Silo 18 Backpack - 1098cu in on February 8, 2010
I am 6'2" and own the Silo 18. I don't think that tall people were the basis for the pack's design but I can tell you that it fits me fine. I do have to adjust the straps a bit but it is simple. For me, it does sit a bit higher but that's fine. The pack is so small that you will not load it up too heavy anyhow.
The pack works great for me - it holds my camelbak 1 liter bladder just fine, ski goggles, food, extra layer and snowshoes. Its built well and takes a beating!