In a bagmaking-and-packaging apparatus, when switching from bagmaking using a first film to bagmaking using a second film, a first impulse sealer interconnects an end-of-bagmaking film of the first film and a starting end scrap of the second film to form a first interconnected film. A second impulse sealer interconnects a third part on a starting end side of the first F1 and a fourth part of the second film to form a second interconnected film.

Disclosed is a post-processing apparatus including: a conveyor that conveys a sheet, wherein a plurality of functional units that perform different types of processing on the sheet conveyed by the conveyor are selectively attachable and detachable to and from the post-processing apparatus; and a slitter that is one of the plurality of functional units, and has a variable cut waste width. The slitter includes: at least two cutters that are disposed in a same functional unit and are disposed at different positions in a conveyance direction of the sheet; and a relative position adjuster capable of adjusting relative positions of the at least two cutters in a direction orthogonal to the conveyance direction.