The creation system includes a receiving body and an automatically rollable flap. The accommodating body has an opening, a first fixing portion and a second fixing portion. The automatic roll-up flap has a flap portion, a strip portion, an upper fixing portion and a lower fixing portion； the strip portion is fixedly integrated with the flap portion, and can be synchronously operated, and has at least one flattened state and one Automatic roll-up status. The upper fixing portion is coupled to the first fixing portion； the lower fixing portion is for connecting or retracting from the second fixing portion. When connected, the strip portion and the flap portion are in a flattened state to cover the opening； when retracting, the strip portion and the flap portion are in an automatically rolled up state and are in an uncovered opening. Therefore, this case has the advantages of being able to automatically roll up the opening of the flap, and it can automatically roll up the flap without opening.
