This 5x7 Card and Photo Storage box holds 5x7 photos and standard A7 (5-1/4" x 7-1/4") cards and envelopes. The finished project measures approximately 7-1/4" x 5-1/4" x 1-1/8". The box has a hinged lid that helps keep the dust and light off the photos which will help protect them and the side slots allow the photos to be taken out of the box from the sides which will keep those finger prints off them too and the lid closes completely so that you can use it for gifting homemade cards along with corresponding envelopes! The file is compatible with both the 12x12 and 8x12 mats. You can find additional images and a full tutorial on my blog on|after 09/28/13: http://jamielanedesigns.blogspot.com/2013/09/5x7-card-and-photo-storage-box.html