By loading both upright and flat tissue clips into their respective cartons by pushing on one end of the clip along the clip's longitudinal axis, a simple flexible carton loading apparatus is possible. To load flat tissue clips, the buckets of the carton loading apparatus are configured to hold the clip such that a pusher head contacts one end of the clip while sliding the clip from the bucket into the carton. To load upright tissue clips, the buckets of the carton loading apparatus are configured to hold the clip such that a pusher head contacts one end of the clip, while the opposing end of the clip is moved either up or down such that the leading half of the clip is folded backwards about a transverse fold axis by a folding plate attached to the pusher head as the clip is advanced through the bucket towards the carton. Upon entering the carton, the clip is folded in a backwards C-shape.