This file comes with two bags. The first bag comes as a one piece cut and is approximately 3-3/4" x 4" x 1-1/2" . The second bag comes in two pieces and can be made larger or smaller. The second bag is sized at approximately 5” x 5-1/4” x 2”. Both bags feature an edge that folds over the front of the box, which is perfect for using double-sided papers! The bags are compatible with both the 8x12 and 12x12 mats. You can find additional images and a full tutorial on my blog: http://jamielanedesigns.blogspot.com/2014/07/fold-over-bags.html