Originally Posted by Kanguru
What the heck is a patrol bag???
It's the lightest sleeping bag in the Military Sleep System - comfort rated to about 30F (I think). The rest of the system is a cold weather bag that's rated below 0F by itself or you can button them together for a -30F combo. The last part is a GoreTex bivy bag. Sometimes you'll see it listed in military surplus as a four part system, but the fourth part is just a compression sack.
The MSS is a cheap and durable alternative to high dollar down bags, but it weighs about twice as much.