The Happy Planner Disney Best Day Ever Undated Vertical Extension Pack Classic is a delightful addition to your planner collection, featuring the popular Disney theme of "Best Day Ever." This 4-month extension pack is in classic size dimensions of 7" x 9.25" and is perfect for adding extra months to your undated planner. Made by The Happy Planner brand in the United States, this planner extension pack is a fun and creative way to keep track of your appointments and goals.