Rich, how much should it weigh???
here is how I pack
Guitar in UV1000C, inside a heavy weight cardboard Gibson shipping box (I get the free from the local store)
I wrap 3 layers of bubble wrap around the case, then use some more bubble wrap to build standoff's between the case and box. there is approximately 2" of space between the case and box. The empty space gets filled with shipping peanuts. Then all closed up and taped.
At the post office, it weights in at 8.08KG's, (maybe my conversion was wrong, I hate metric) but due to the size of the box, is supposed to weigh 15KG's, so either way, I'm safe.