My jervenbag came with a sort of dry bag which just about holds the liner but it seems impossible to put the liner and the windproof outer into this when they are connected. Looking on the forum the "pillowcase" looks like a much better way of carrying the whole thing. Does anyone have a pattern for this?
I could measure mine and let you have a pattern if you like but it's a very simple thing, just a rectangle of fabric sewn to make a more or less square pouch (about two feet square) with a flap which ic held closed by velcro.
There are three compression straps which are sewn onto the case. They let you hold it in a sort of sausage shape when you roll it up but I'm sure there are other ways of doing that.
The fabric used by the manufacturer for the pillowcase is the same fabric as the outer shell of the bag itself. It protects the bag well but if you used a more open-weave fabric it might make a better pillow case.