Just saw this discussion,so thought i would add my grammes worth.
Just got back from the Pyrenees [Cauterets area].On starting out for our 9 days my wife and i were carrying less than 10kgs.They weighrd in at the airport at 10.2kg and 10.3kg,this included boots,walking poles and all walking gear,we wore smart clothes.
All the time we camped wild usually above 2400m,we carried all our food and gas,evening bringing down at least 2 days supply of food.I usually work on 500 to 70gms of dehydrated food per day.To do this i usually only use 5 main ingredients;Porridge,Potato powder,Colmans cheese sauce mix,Sosmix or Burger mix,Instant Semolina.These all require the minimum of cooking ,just boiling water and leave them to stand insulated in your hat.With this we managed to get a 250gm gas cylinder to cook 2 hot meals a day,this includes soup tea and coffee.
For lunches we ate a variety of grain bars bread and a piece of local chorizo sausage.
We carried all our gear in KIMM sacs and i was using a new PHD 900 fill sleeping bag weighing 490gms.The tent was a Mountain Equipment AR Ultra light with no poles as we used our trekking poles.
Other excellent light weight pieces of kit were a Haglofs fleece hoody ,2 Odlo base layers and Haglofs trousers.
If you really want to get the weight down look at your food,we got our variety of tastes by different flavours added through soup cubes.
All this made it very cheap thus allowing one to eat in the best restaurants when you get down off the mountains.
My one word of caution is that even a light load in a small rucksack seems to feel heavy because it is very concentrated,but i have tried light loads in larger rucksacks and they do not feel correct as they can slop around...Its those extra grams that break the back packers back...