Your clothing and cooking is probably where you will find the biggest drop in weight. Most people bring too much clothing and too much "kitchen". After that, look at your sleeping bag. Getting it under 3 lbs will help a lot in weight and space saving. Then look at shelter options. I wouldn't buy a pack until all these have been gone through. Kinda like what OM and others said.
_________________________
I've taken a vow of poverty. To annoy me, send money.