Looks like a nice list with some thought-out gear. I just looked it over quickly, but I didn't see some things like compass, maps, and whistle listed.
Does your pad actually keep you warm down to freezing? I'm probably picturing a thinner pad than what you're using.
Are you using iodine or chlorine dioxide tablets? Iodine doesn't work on some protozoa, and chlorine dioxide effectiveness depends on water temperature. This probably isn't a concern if you select your sources carefully though. I'm just pointing it out as something to take into consideration.