the response below didnt answer my question so ill rephrase: will i be uncomfortable in this bag if early evening temps are in the 40s or 50s?i know there are a lot of factors, but whats the warmest temp (approx.) youd personally want to use this bag for?

Hi Surrational, long story short. A 15 degree bag will be fine for 40 and 50 degree weather, and you'll be quite comfortable. Hope that helps!

Not much passed the bags rating of 15 F degrees really. I mean even 20 F degrees is freaking cold to be out camping right? Most folks that go winter camping are using much warmer bags than the temp they are actually camping in. Also, tents and good shelters (snow caves) provide a bit of warmth so you must factor that in as well. The question remains... What are you using this bag for?
View Details: Mountain Hardwear Ultralamina 15 Sleeping Bag: 15 Degree Synthetic >