Quick question, and forgive me if I seem a bit dim, but I recently bought an unissued military goretex bivi bag - should I fold and roll it, or shove it into a stuffsac? I ask because I recall reading a view somwhere which said that folding and rolling can damage the goretex over a period of time. The bag is a bit stiff with a central zip. Thanks in advance, and I hope that everyone had a good Christmas. 
