White sturdy foam core storage boxes.  Available also is a packet of red alphabet letters (A-Z) with 3 sheets included ($12.95).  All sold separately.

Small (26.5cmD x 17cmW x 13.5cmH) - $14.95

Medium (35cmD x 27cmW x 13.5cmH) - $29.95

Large (55cmD x 35cmW x 13.5cmH) - $36.95

Crate (tapered 35cmD x 27cmW x 27.5cmH) - $36.95