Also keep in mind that many bag makers now use the European standard for temp rating. A zero degree bag doesn't mean you'll be warm and cozy at 0. It means that you can survive at 0. The bag will be warm and cozy at 10 to 15 at the lowest, maybe 20 if you're a cold sleeper.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.