Stackable Storage Bins TrolleyDetails of: Stackable Storage Bins Trolley Features One or Four? This set of 4 organizers can be used individually as 4 storage boxes or stacked up as a drawer storage unit as you like; 2 tiers, 3 tiers, or 4 tiers? Let them shapeshift according to your needs Where to Use Them? In the bathroom for toiletries, in the study for books, or in the bedroom for clothes. With 4 wheels (2 with brakes), you can slide the trolley to where you need it, or use the