Wilton Transport Box Reversible Base This sturdy transport box from Wilton is especially handy for rectangular cakes. But that's not the only thing. This 'caddy' is also ideal for cupcakes and muffins. That's because the bottom (the base) is reversible. One side has a tray that is suitable for 12 standard cupcakes, the other side a tray for 24 mini cupcakes.