A box in a box ... This is important !!!... As you can see the inner box is compressed and bulging a bit and several layers of foam have been placed between both boxes. More material and foam layers will be placed on top before the outer box is closed. This type of packing is very important because the layers of foam and cardboard absorb the energy of the shock if the box is dropped ... Again I pack enough material between the inner and outer boxes to make sure the outer box bulges just a little so that the foam is held in place by compression . This rare insulator will arrive at it's destination safely!