Two cube sizes solve a real problem in a child's room, because picture books and stuffed animals do not fit the same box. The shallow openings measure 14 by 11 by 7 inches and the deep ones 21 by 11 by 11.5 inches, spread across 5 compartments in a 44 inch run. Standing 24 inches tall, the whole unit sits below a preschooler's shoulder, which is what makes tidying up something they can do alone. The base lifts 4 inches off the floor so books on the lower level stay clear of dust and mop water. Engineered boards and MDF hold 132 lbs on the raised-edge top and 44 lbs in each cube, with reinforced back buckles and anti-slip pads adding stability. Assembled weight is 46 lbs.