I use a eight year old Haglöfs Travelite (no longer in production). It is very thin and light, 700g or so, and is very small packed. Comfort temperature +10C (or +5C... can't remember, but it should be +10). I have used it for ~200 nights, everything from tentless camping in Spain to high in the Alps. Some nights have been very cold and I will get a warmer bag next time, but I can't complain about the quality.

/Csson