A parcel processing system (400) includes infeed conveyors (404, 406, 408) each conveying parcels (106) with an assigned orientation class, a merging conveyor (410) configured to merge parcels fed by the infeed conveyors into a single stream of parcels, and an induction conveyor (200) configured to feed the merged stream of parcels along an induction feed path (202) to a sorting conveyor (100). The infeed paths (404a, 406a) of the infeed conveyors are arranged at different angular orientations in relation to a merging feed path (412) of the merging conveyor such that each parcel in the merged stream of parcels has an orientation that is dependent upon its assigned orientation class. The merging conveyor (410) includes a multi-axis transport mechanism configured to move parcels along a principal axis parallel to the merging feed path and a secondary axis perpendicular to the principal axis, the merging conveyor being operable to selectively activate movement along the secondary axis for centering parcels being loaded thereon.