Re: Light Weight Sleeping bags
@ David Walter: Yes! Highly Recommended.
Currently have a *used* (perfect condition) Gortex ECWCS 3-Part Sleep System. Woodland Camo. Gortex outer, OD green Patrol bag, and black Intermediate Cold Weather. A tad voluminous but the System is configurable allowing the weight/size of the System to "scale" based on your intended environment. With all 3-bags, the System is temperature rated to -40deg F for 3hrs.
I've used the System in various conditions ranging from snow, sand, rain, and wind. Solid A! In fact, my son's Scout buddies even requested this System for Christmas.
Understand there are lighter, better, smaller bags on the market. However, their cost typically far exceed the miltary 3-part System.
Note: the bag is $300 (new) or $150 (used - reconditioned) online.