Busky2: My Neo was the original Yellow and silver one, I think its been superceeded by a more robust but heavier mat. I always folded it flat and it took very little space in my pack. It came in three sizes, I have the large. It is a very comfortable mat.
Many people complained that this mat was noisey but I did not find it so.
Enjoy your hike, I certainly did and I think about it daily. I will be attempting the PCT in April, with my hammock.
actually they just replaced it with the neoair xlite, the regular version is only 12 ounces!