These bags are so much fun! I designed them so you could use them in two different ways, open or closed (shown in box image) and the bags even fold flat so you can store them until they are ready for use! The bag is approximately 4" x 2-7/8" x 8” and is compatible with both the 12x12 or 8-1/2x12 mats. You can find additional images and a full tutorial on my blog: http://jamielanedesigns.blogspot.com/2014/05/tie-boxes.html