Here is a link to Buffalo Systems....you should look at the Super S sleeping bag and their Mountain shirt in OD Green...you can leave the liner and use the shirt instead...the bag has shoulder zips which make it perfect for military and climbing use as you can keep it on and use your hands...it works like a poncho then....it works soaking wet through....you just wring it dry and it dries out quickly...it washes in a machine wash....I got this system in 1980...they started in 1979...this stuff lasts!
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http://www.buffalosystems.co.uk/index.htm

The sleeping bag is a bit heavy though....if you want a lighter two bag system try the Snugpack military bags

http://militarykit.com/product_categories/sleeping_bags_snugpak.htm