A cheap British Army Goretex Bivvi Bag makes for a more comfortable nights sleep than any cagoule being much more comfortable and waterproof. It is also has room enough to make a change of clothes in. i.e. allows you to get out of wet clothing for dry. I personally wouldn't use any material which isn't MVP (Moisture Vapour Permeable) including mylar blankets or the cagoule available at

http://www.campmor.com/outdoor/gear/Product___77708

as it simply would make for a really poor nights sleep.

The Hilliberg bivanorak is at least made from an MVP material.

The Laksen Moose Jacket has a very large game pocket at the lower back and it is large enough to take the Goretex Bivvi.



Rolled up British Army Goretex Bivvi bag and the large game pocket on the Moose Jacket



The Moose Jacket has lots of other useful pocket space.