RE: Backpack List....OK??
I'd 2nd the thought of ditching the lantern. I'd also ditch the Ax. Another way to save weight might be to ditch the stove and fuel and cook on a fire. If all you're doing is boiling water and there isn't a fire ban and there's plenty of fuel...why not? And, if that is the case then why not leave the purifier at home and carry something for the taste of the boiled water. That should be about 5lbs right there. You could also ditch the wetstone and just take a diamond honing rod. Lighter and mostlikely all you'll need. Hopefully your also looking at sharing things with your dad that can be divided between the two of you...tent & cooking stuff and even the GPS and range finder if you're staying together.
Spud