A plain-language guide to what corrugated board is, how it's built, and why it's the standard choice for shipping and retail packaging.
Corrugated board is made of three or more layers of kraft paper: two flat outer layers (liners) with a wavy, fluted layer glued between them. That fluted middle layer is what gives corrugated board its strength — it acts like thousands of tiny arches, resisting crushing forces from any direction while keeping the material lightweight.
This simple sandwich structure is why corrugated boxes can protect heavy or fragile goods during shipping while using far less material (and costing far less) than solid wood or rigid plastic packaging.
The size of the "wave" in the fluted layer changes how the board performs. Common flute types:
Single wall (3-ply): one fluted layer between two liners. The standard choice for most shipping and retail boxes.
Double wall (5-ply): two fluted layers, three liners. Used for heavier products, stacking strength, or longer transit.
Triple wall (7-ply): three fluted layers, four liners. Reserved for very heavy, industrial, or export/pallet-level loads.
Protects contents without adding significant shipping weight or cost.
Cheaper to produce and ship than wood, metal, or rigid plastic alternatives.
Made from renewable kraft paper and widely accepted in recycling streams.
Flexo and offset printing let you brand boxes directly, no extra labelling needed.
Cut and scored to your exact product dimensions — no wasted void space.
Engineered edge-crush strength supports safe warehouse and pallet stacking.