I've spent far too much time searching for lost or injured people wearing those soft and muted colors. I firmly believe one should at least have some really bright options to deploy. It is much easier to lose a pack made with dull colors than one that has some bright spots. In the days when about all we could get was army surplus, we used to tie bright flagging ribbon to the pack so we could find the darn thing after we had set it down.

On a really good trip, you will be far enough into the back country that you are not going to encounter anyone, so the color you wear will be irrelevant.