A sewing machine is a heavy, precise instrument with a sharp needle, delicate timing, and many small removable parts. Its weight sits high and its internal mechanism can slip out of alignment if jolted. Removing the needle and accessories, securing the moving parts, and cushioning the body well protect both you and the machine.
Pro tip: If you kept the original hard case, it is the best container for a portable machine.
Watch out: Remove the needle before packing. A loose or installed needle can bend, snap, or puncture the wrapping and you.