A shape-retaining hoist type rectangular parallelepiped bag includes: a rectangular parallelepiped bag that is a generally rectangular parallelepiped-shaped bag that has an internal space to accommodate an accommodated object; a bottom surface holding mechanism configured to hold a bottom surface by application of a tensile force thereto; a side surface holding mechanism configured to hold a side surface by application of a tensile force thereto; a central hanging body configured to extend in a vertical direction with one end thereof being fixed to a center of the bottom surface of the rectangular parallelepiped bag and hold the bottom surface holding mechanism and the side surface holding mechanism at intermediate positions in the vertical direction; and a ring-shaped hook holding portion connected to the other end of the central hanging body, to which a hook is to be attached. This provides a rectangular parallelepiped bag that is less likely to tear despite its small aspect ratio and large height, can compact soil particles by stages in its height direction, has a stable strength even when the bag has a large height as in a case where the bag has a ratio between a height and a width of the bag exceeding 1:1, for example, and is less likely to be deformed when lifted upwardly in the vertical direction.