I some how, some way misplaced the outer shell to the sleeping system. Its the bag you put the entire thing in. Does anyone know where you can purchase just the bag? I have to turn in the sleeping system soon and really don't want to fork over the $200+ for the sleeping bag.

Try a surplus store, or, sometimes the Sportman's Guide sells the used bivy bags.

Whose sleep system are you carrying? I know Slumberjack sells their MSS system pieces separately.

Slumberjack MSS Compression Stuff Sack

Good luck.

ebay is your friend, I got the green patrol bag for like $25 shipped