The purpose of creating a Cute Pink Cream and Yellow Lost Bag Poster is to inform people of a lost bag and encourage them to come forward with any information related to its whereabouts. The poster's design is intended to catch people's attention and make the details of the lost bag more memorable, increasing the likelihood that someone will remember seeing it or know where it might be. Overall, the goal is to reunite the bag with its owner and minimize any inconvenience or stress resulting from its disappearance.