If you are looking for an envelope perfect for baby shower invitations, wedding invitations, holiday cards, Birthday cards, Greeting Cards, Photos, CD/DVD, thank-you cards, and more, our EnDoc square 6 x 6 envelope is an excellent option. These square flap envelopes are also perfect for direct mail, letters, postcards, and 5 1/2 x 5 1/2 photos and all your special mail needs.