I especially like the way the pack flips over itself to close making it impossible to gain access. There's a brilliant military logic that says you're not supposed to delve into your pack until you're ordered to do so. I've seen diagrams showing how each regulation issued item is to be packed. I guess that's Prussian efficiency.
My own version is now used to pack all my night time gear when I travel for an overnight. It's a foolish notion but I love the mix of canvas and leather. I'm prepared to put up with Prussian craziness for an aesthetic experience.