I am having Hammock Gear make me a snakeskin made of mesh for my Warbonnet Blackbird Hammock and my Hammock Gear zero degree underquilt. They had me do a compress, not too tight, of the rig at the widest part and give them the measurement. They will make it from that. I didn't think about my zero degree sleeping bag but if it doesn't fit I'll just use a Sea to Summit e-Vent compression sack. I use a lot of them to get the most compression.

I also purchased and received a single piece snakeskin for my tarp in mesh to dry quickly. Luv it. Used it twice so far. Sure makes life easier as I expect the hammock sleeve to do.