Looks like a well thought out list.
A few things I really think need to be added:
a knife, sun glasses, bandana (or other multi-purpose piece of cloth - I use a small micro-fiber hand face towel), whistle for signalling, a bit of extra rope, duct tape (though maybe that is part of your unlisted firstaid kit).
You don't list any pants, tights, or shorts. Might want to add something there :-)
A number of things to consider:
compass & map (unless you completely know the area and there is no chance of getting lost).
At .3oz it doesn't seem like you have a windscreen for your stove. A windscreen makes a huge difference in the efficency of a stove.
depending on the bug situation... you might want something to protect you while you sleep
I would add at least one extra pair of socks
I would add a second water container since you are using chemical treatment. If the water is cold you are going to have to wait awhile before you can drink once you have treated your water.
A hat to protect you from the sun
I tried the spork... I switch back to a lexan fork & spoon because they were easier to eat with, the same weight, adaquately durable, and didn't scratch up my pot.
Your back is less sensitive than mine, I can't image not using my insulated air mattress these days.
I have done tried trips without full on raingear in the past... it was uncomfortable enough that I now bring at least a rainshield 02 cycling jacket.
I would bring some sort of camera
I burn easily so I bring sun lotion for skin exposed (like my hands).