A cartoning apparatus for loading stacked article groups into carton sleeves. The cartoning apparatus comprises at least two article infeed mechanisms, each supplying at least one stream of articles at a predetermined height or level, an article selection and transport mechanism intersecting the article infeed mechanisms to form and move a stream of stacked article groups of a predetermined pattern, a carton supply and transport mechanism synchronized and moving parallel with said article selection and transport mechanism to provide cartons with open ends facing the moving article groups, and an article group transfer mechanism constructed and arranged to move article groups into the open ends of the carton sleeves.