Please don't worry. I pack the item very well and ship it out.
I will explain how I pack Guinomi Japanese glass Sake cup.
I wrap cap with thin fine wapping paper.
Then, I wrap it with bubble wrap.
Then, I put it into the accompanied paper box( I will make sure not to create any gap inside box).
I will, then, wrap it with bubble wrap again.
I put lots of cushions around cardboard box(newspapers , air cushion).
Apart from this, please contact me if you have a shipping request:).