This envelope works with my Holiday Photo Sleeves! The envelope is approximately 6-1/2" x 4-1/4" when complete. Please note that this is only the envelope, the photo sleeves are sold separately. This file is compatible with both the 8x12 and 12x12 mats. The file is compatible with both the 8x12 and 12x12 mats! You can find additional images and a full tutorial on my blog: http://jamielanedesigns.blogspot.com/2014/11/4x6-holiday-photo-sleeves.html