To establish a suitable package that can suppress rapid postharvest softening of forcing-cultured 'Tonewase' Japanese persimmon, the performance of carton boxes, coated with a water-impervious material, was investigated under experimental and commercial distribution conditions. Packaging fruit in the improved carton boxes kept relative humidity above 70%, effectively reduced weight loss, delayed ethylene induction, and suppressed fruit softening under experimental and commercial conditions, compared to those shipped in conventional carton boxes.