When packing these items, how delicate/fragile are they? How big?
Parents of my daughter’s friend specialized in buying/selling high end antique glassware. When shipping they would buy a small “Igloo” brand style hard sided cooler with a flat top, maybe $10-15.00 at Walmart. Wrap the item in bubble wrap, and put the item in there along with shredded paper surrounding the item. Remove the cooler handle and wrap the bejesus out of it with packing tape.
The hard sided cooler made it almost indestructible during shipping. They said they never had an issue with broken items after they started shipping items this way.