Originally Posted by Theophilus
Check out Wiggy's two bag FTRSS system. Their bags are the best and the owner of the company really knows his stuff. His system is used by Special Operations Forces and if you ever speak to Jerry the owner he will talk your ear off. He's a salt of the earth guy who stands behind his product.
I've slept under the stars at -30 in Alaska for days on end and his bags are all that. Find an Army Poncho Liner and put it inside your bag. It will add quite a bit of warmth and a good skull cap.
I completely agree with Theo here! Having been an 'ole Paratrooper/Infantryman with the 82d Airbrone Division (2001-2005), I know for a fact that these sleep systems work extreamely well! Also, adding a 'poncho-liner' like he said really does add quite a bit of warmth.
ALSO, if you have an Army Surplus store near you, check it out and see if they have any of the Army's 3 part sleep system;
It is a gortex/waterproof bivy sack, a Green lightweight sleeping bag good up to temps in the mid 30's, and then a Black Sleeping Bag good for even colder temps. The great thing about this system is that ALL 3 of the pieces, bivy, green, and black sleeping bags can be zipped and/or buttoned togehter to keep you completely dry, and warm! It also comes with a nice compression sack that allows you to cinch it down to about a bowling ball size...maybe a bit bigger, but still packable.
If I find a link to it, I'll post back up.