This Card and Envelope Storage box holds A2 cards (4-1/4" x 5-1/2") and A2 envelopes (4.375" x 5-3/4") and would also be great for storing similar sized clear stamps, stationery sets, or even storing items on your desk! It is approximately 9-1/4" x 3-1/2" x 2-1/2" and contains two compartments that are each just over 4-1/2" wide. The file is compatible with both the 8-1/2x12 and 12x12 mats. You can find additional images and a full tutorial on my blog: http://jamielanedesigns.blogspot.com/2013/09/card-and-envelope-storage.htmlCards and Envelopes are not included.