Mondo Rectangle Half Slab White Cake Box 16 x 20 inch (6 inch tall)

The Mondo Rectangle Half Slab White Cake Box is built for large sheet cakes and slab cakes that need a serious box. At 16 x 20 inches (40.6 x 50.8 cm) with a 6 inch (15.2 cm) tall wall, it comfortably fits a half slab cake — ideal for events, catering, and large group celebrations. White food-safe cardboard construction keeps your cake secure and looking fresh during transport. Find it alongside our full range in our cake boxes collection.

Key Details

• Base size: 16 x 20 inches (40.6 x 50.8 cm)
• Height: 6 inches (15.2 cm)
• Fits: One half slab / large sheet cake (approximately 16 x 20 inch)
• Serves: Typically 40–60 portions depending on slice size
• Material: White food-safe cardboard
• Brand: Mondo (by Kware)
• SKU: 01MO403

Best For

• Half slab and large sheet cakes for events and catering
• Birthday and party cakes serving 40 or more guests
• Corporate and workplace celebration cakes
• Slab cakes with buttercream or fondant finishes
• Safe transport of large flat-iced cakes to venues

Frequently Asked Questions

What is a half slab cake?

A half slab cake is a large rectangular sheet cake, typically baked in a 16 x 20 inch (40.6 x 50.8 cm) pan and designed to feed large groups. It is half the size of a full slab. This box is sized to fit exactly that format.

Will this box fit a cake with piped rosettes or a buttercream border?

Yes. The 6 inch (15.2 cm) height provides enough clearance for standard buttercream decorations. For cakes with taller piped elements or standing decorations, measure your cake height before purchasing to confirm fit.

Browse our full cake boxes collection, including our rectangle slab cake boxes and square sizes.