This is a description of how I pack my sewing machines.

1. First I use bubble warp and shrink wrap to secure anything that moves to the deck of the sewing machine.
   
2. Next I cut a piece of foam to match the size of the machine and attached it to the bottom of the machine with shrink wrap.  I also wrap the whole machine in bubble wrap and more shrink wrap.
   
3. Next the sewing machine is placed in the inner box.  And more foam is used to pad the machine so it can’t move.
   
   At this point I cut the box to match the size of the sewing machine and seal with heavy duty shipping tape.
4. Next the inner box is nestled in a 200# cardboard box using non collapsible packing peanuts. In addition, an extra layer of cardboard is placed in the bottom of the box.
   
5. Finally more peanuts are put on top with a extra layer of cardboard and the box is sealed with heavy duty shipping tape.
   

    So far there have been no complaints of damaged machines.