For me, in the winter (UK) it's:
Snugpak SF2 bag - 1800g
TS1 liner - 350g
DPM basha - ~600g
Pegs - 60g
DPM bivvi bag - ~600g
Exped Synmatt UL + pillow pump - 455g + 145g
Crusader cooker + cup + bottle - ~500g
Firesteel - 32g
Knife - 65g
LMF spork - 15g
For a total of 4.622kg
That doesn't include a pack. Depending on what I'm doing, I may take any of a selection of packs weighing 1.2kg-2.8kg. I am saving up for a 1kg pack that I like the look of.
Obviously this is just the base kit, depending what I'm doing, other things may get added to it. In summer the only change is replacing the SF2 with a SF1 bag at about 1.2kg.
J