Winter or summer?? It makes a huge difference. What pad are you going to be using? The ground insulation has more bearing than most people realise when they start buying gear.
My beloved wants me to clear some of my stuff so I do have some gear available. It is on the heavier end of the scale tho
WE "Breakout" Large hip-belt; size 2 ( I bought this here on the forum but it is too small for my winter gear) practically brand new and I do not need 5 rucksacks about 3kg $195-
http://www.wildequipment.com.au/backpac ... Code=WEBO2Generic foam inflatable 25mm thick full length Wild Country brand 900grams $10-
Thinsulate mummy bag 1k $20-
I was using it as my emergency ski touring bag in combination with a cheap Home made bivvy sac ( elephants-foot type )
Older down travel bag from Mountain designs 1.15kg $20-
Actually the combination of the 2 cheap bags would be good down to freezing and lower with clothes on.