In reply to ROSP:
First thing: it doesn't matter what other people think about how your pack looks. Do what suits you.
Second thing: I personally prefer everything inside because things on the outside swing and clink with my movement and the wind, which gets on my nerves after a while, and in a high wind is slightly energy-inefficient.
The exception to this is my helmet, which I wear most of the time, simply because a helmet is bulky so it's the easiest way to carry it, and also because it helps my hood stay where I want it, whether that is up or down. (And thirdly, because even in Scotland, on some routes you actually want head-protection on the approach and retreat.)
Post edited at 18:23