I recently dropped this bag on a bed sheet (to keep grass off it) with a 3/4 ThermoRest out in my front yard. Overnighted in -5F and slept quite comfortably in light tights, Stoic longsleeve base top and plain white socks. I DO wish I would have had the foresight to bring out a beanie as the cold spot on my head woke me up a few times, but I overlapped the baffles and ducked a little deeper in and slept fine. 6'-1" 180lbs. I have a Long Right and had plenty of room for movement even after ducking in with boots in the bottom. In a tent in same temp, this bag probably would have been borderline too warm for me. Weight and compressability are meh...but nothing outrageous for a synthetic bag of this rating. ZERO regrets with purchase so far.