Sleeping bag for Extreme cold.

Gentlemen.

Has anyone here experience with sleeping bags that are made for extreme cold?  Im going hunting and we will be sleeping up in the mountains in a tent.  I need a new sleeping bag and am thinking if I should get a waterproof one, or just something that performs in the cold?

One thing that bothers me while sleeping outside is breathing the cold air all night long. Is there a bag that offers a shield over the face as well?

Thanks for all suggestions

I have been known to winter camp in the mountains here.  I use a goose down mummy style sleeping bag.  I wear a rabbit fur hat that covers the ears.  What makes a huge difference is the underlayment.  I use a thick foam bedroll.  If I happen to roll off of this I get cold very fast.  My friend wears a balaclava to cover his head and he likes it.  It is not too comfortable for me though. 

The latest sleep system the army uses is real good and versitle. You can likely find one in most surplus stores. It is a three part system and is built to be compact. I don't know the rating but I know we have never needed the complete system and we've been in some cold places. One helpful hint no matter what system you have is keep a number of softball sized rocks by your camp fire and place a charged (hot) one in the foot of the bag. You won't get cold. As for breathing cold air. If the bag doesn't come with a head cage you can make one out of 1/8th rod stock from Lowe's. One or two peices about 20ins. is good. Just leave them straight until you need them and then bend them half moon to fit snug in the bag over your head. Once in the bag put them in place and zip it to a three or four inch opening. You'll get the air you need and it won't be too cold. I would expect they would cost between 70.00 and 120.00 depending on the store. The army chages a soldier 360.00 for a lost one. Good luck!

Thanks. I think I like the mummy style bags and something that is compact to carry.

Edited by shooter4 - September/30/2009 at 11:52

I shop @ REI and I'm very happy with them.

Maybe you need to dig a hole and make a huge fire and then cover up the still warm coals with dirt and then roll out your bag on top of that dirt.....and a good bag would be necessary, too.