What is the net weight and outside size of the iPad mini box when new? What are the physical dimensions of one iPad mini box? 

I want to order two iPads mini and then have them shipped in one box but I'm worried about the width, height, depth &amp; size of the outer box because I'll do international shipping.

Precise measurements are very much appreciated as I wish to be specific about the rates &amp; costs.
For the reference:

Length: 21.3 CM 
Width: 14.7 CM 
Height: 3.3 CM 
Gross Weight: 0.5 KG