Card in the box is approximately 4 ¼ by 5 ½ inches and will fit into a mailable A2 envelope. These cards are unique in that they fold flat for mailing and then “pop up” to share your message for that special occasion. Recently added are Cascading Cards, which are like a Card in the Box in that they expand when you open them but yet can still be mailed in a normal envelope. It is easy to personalize these cards with your choice of colors and the recipient’s name or occasion. Just ask what Paper Dreams can do for you!