I am quite interested in Cumulus X Lite 200 model with maybe 20 grams overfill. With that Toray outer the whole thing only weighs 360 grams (!) for above the 5 degrees mark. It really looks like they have several options in the 400 gram range and are priced well. I use a bag below about 2-3. May I ask have the users above used an accurate thermometer like a fridge one in your tent or relied on weather forecasts to determine the temps you in which were comfortable? Ta.