I took this bag on a 3 week motorcycle trip to Yellowstone, and Glacier NP, the evenings hit mid 40s and I was warm as could be! It so small and light that it packed well on my bike. I could not be happier and feel like it would work well in even colder conditions! I am very happy with all my purchases, this gear is very light and durable.
I used it with the insulated sleeping pad and was never cold.