I thought this box was very impressive. The buyer sent it to me to safely ship his multipart suspension insulator. For size comparison, my 5' 3" tall daughter, Christina, consented to be in the picture holding a standard 8" x 8" x 8" priority mail box that you use for most glass insulators.
This is a "Rain" double box with padding space available in the inner box and 4" of padding space between the inner and outer boxes. The box has been across the country twice.