I totally agree with demo as well, and I too use a Walmart inflatable neck pillow. I think that for true backpacking you can't get much better for weight or compressibility without having something that will compress under you leaving much to be desired. I wouldn't through hike with mine, because the fleece cover stinks after only a few nights use, but I would figure something out for that. My car camping pillow is a 24"x14"x1" piece of open cell foam that is folded into 3rds inside a jersey cotton pillowcase. It weighs right at a pound and compresses to about the size of a soda can when it's really compressed, but its the most comfy pillow I have tried to date. Anyways that's my two cents. (for what it's worth)
"We do not go to the green woods and crystal waters to rough it, we go to smooth it."- G. W. Sears
My forum name is Fish<><; I'm in the navy; and I hate sleeping on the ground. If I didn't need ground to walk on or measure resistance to, I think I could happily give it up.