Abstract: The present invention relates to successive plastic bags, a plastic bag cartridge, and a wastebasket containing the plastic bag cartridge. The successive plastic bags include unit plastic bags in each of which symmetrical, sideways M-shaped folded portions (M1 and M2) are provided on both sides thereof in a longitudinal direction and a sealing line is provided in an end portion thereof opposite to the entrance end thereof in a state in which one of both the sides has been turned to the other side around 180 degrees along the center portion thereof in the longitudinal direction. The unit plastic bags have same specifications, are successively connected to each other and are wound in a roll pack form, a cutting line is provided, and the entrance end of the subsequent unit plastic bag is opened when the each unit plastic bag is separated.