These nesting swing boxes come in three sizes and are easy to cut and assemble. The file comes with the three box bases and their coordinating mats. The boxes have a hinged opening allowing them to 'swing' open and have a slot/tab for closure. The boxes can be used stacked or nested. All boxes are compatible with both the 8x12 and 12x12 mats. See a tutorial on my blog! Small Box is approximately 2-1/8" x 2-1/4" x 2-1/8" Medium Box is approximately 2-3/8" x 2-1/2" x 2-3/8" Large Box is approximately 2-5/8" x 2-1/2" x 2-3/4". https://jamielanedesigns.blogspot.com/2019/04/nesting-swing-boxes.html