Hi all, I'm new to the forum and new to multi day hiking too. I have a bit of a dilemma I was hoping some experienced people could help me with.

I currently have a big agnes buffalo park bag and insulate ba aircore mattress. I've been planning for a while to buy another big agnes in the 0 - 20 degree range that I can layer with the other.

However last week I camped for the first time in 15 degree temps (with an old Coleman 0 degree bag) and it really made me question whether the big agnes sleeping pad design could stand up to these types of temperatures (I was using the coleman and sleeping on a thick air mattress). I could layer five bags together, but it wouldn't make much of a difference if the only thing between me and the frozen ground is a 2 1/2" thick air mattress.

Does anyone have any experience with big agnes bags at these temperatures?
Am I worrying for no reason?
Is it feasible to get something like a Cat's Meow North Face bag and layer it with my big agnes?

My price limit for a bag would be not much more than $200 if anyone has any other suggestions.

Any and all info would be a great help.