Breakage rarely happens from a dropped box. It happens from movement inside a box that was underfilled, or pressure from a box stacked above it. Good packing removes both.
Plates travel on their edge
Wrap each plate individually, then stack them vertically like records in a dish barrel. Flat-stacked plates concentrate the weight of the whole stack on the bottom piece.
Fill every void with crumpled paper until nothing shifts when you tilt the carton. If it rattles, it will break.
Glassware needs a cell divider
Stemware benefits from cardboard cell dividers, which stop glasses knocking together. Wrap each piece, place it upright, and never lay a wine glass on its side.
Artwork, mirrors and TVs
Tape a large X across mirror and glass surfaces to hold the pane together if it cracks, then corner-protect and use a mirror carton. Framed art travels upright, never flat.
Televisions ideally travel in their original carton. Without it, use a purpose-made TV box, screen facing outward, and never place anything on top.
Label what matters
Mark fragile cartons on the top and at least two sides, and note which way is up. A label only visible on a face that ends up against the truck wall does nothing.