Fluted boxes, often referred to as "corrugated boxes," are a type of packaging made from corrugated paperboard. These boxes are widely used for packaging, shipping, and storing a variety of products due to their strength, versatility, and cost-effectiveness. Corrugated paperboard consists of three layers: an inside liner, an outside liner, and a fluted or wavy medium layer. The fluted layer, in particular, provides strength and cushioning, making corrugated boxes suitable for protecting items during transportation and storage.


Fluted boxes are constructed from three layers:

Linerboards: The flat, outer and inner surfaces of the box, typically made from kraft paper.

Fluting: The wavy middle layer that provides rigidity and cushioning. Different fluting sizes (A, B, C, etc.) exist, affecting thickness and strength.

  • A-Flute: Thickest and sturdiest, best for heavy or fragile items.
  • B-Flute: Medium thickness, balance of strength and printability, commonly used for food and retail packaging.
  • C-Flute: Most common, good balance of strength, cushioning, and printing, used for general shipping and display boxes.
  • E-Flute: Thin and lightweight, good for small boxes and point-of-purchase displays.
  • F-Flute: Extra thin and rigid, excellent printing surface, used for cosmetics, jewelry, and clamshell packaging.

Strength and Support: The flute's wavy form acts like tiny beams, increasing the box's compression strength and allowing it to hold heavier items without crushing.

Cushioning and Protection: The air pockets created by the flutes absorb shock and protect delicate contents from bumps and knocks during travel.

Stackability: The flutes help maintain the box's shape, allowing it to be stacked securely without buckling under the weight of other boxes.

Printing Surface: The flat liners provide a good surface for printing designs, branding, or information directly onto the box.