I really love the versatility of these bags. You can size them to fit your needs so they can hold greeting cards, tickets, gifts, even silverware for parties! You could even cut these in vellum to create your own glassine-like bags! All of these are compatible with both the 8x12 and 12x12 mats. This bag comes sized at approximately 6" x 4-1/4" with a fold over flap and can be sized to fit your needs. http://jamielanedesigns.blogspot.com/2015/12/valentine-envelope-bags.html