Making sure there is no noise when shaken is the key

I've noticed that some sellers are suffering from weak packing and shipping and it's effecting their DSR's.  Let's see if I can help.
I used to have a stained glass studio and learned how to ship fragile items.  The more vunerable the item, the better you have to do.
First, and most important, pack so when you are done and shake the package, you hear NOTHING.  Total silence.  Styrofoam is ideal for this.  (did I spell that right?)
Next, if it's something like glass, pack in a box and then set that package inside another bigger box and again, pack until you hear silence.  Believe me, it'll get there fine and you'll get positive comments about it.  Remember that things like glass doorknobs for instance, might seem tough as rocks but in the mail system they can roll and knock against each other and arrive all chipped up, so wrap them separately and then do the packing I discribed.