now if you want to shave a few extra pounds out of that pack id suggest dumping the water pump and using purification tablets. thatll save you at least 2bls. second id ditch the stove and go with MRE' s. i know some of them are terrible tasting but you can get some that arent all that bad. they have a self heating device so all you need to do is add water to them to activate it. you could also dump the tent and go witha bivy sack. id only do that if the weather isnt going to be to drastic. if you want some extra ideas check out Cameron Hanes website. he has a DIY section on there where he lists some of his back country gear.
www.crhpublishing.com
he definately knows his stuff. and dont be afraid to email him. hes very good at responding to them quickly.