This hinged box is approximately 4-1/4" x 4-3/8" x 1" and is compatible with both the 8x12 and 12x12 mats. The files come with the one piece hinged box and the coordinating mats. This is perfect for holding small gifts or baked goods! You can find a tutorial on my blog here: http://jamielanedesigns.blogspot.com/2015/08/3d-425-hinged-gift-box.html