What is corrugated cardboard and when should I use it?

Corrugated cardboard (also called corrugated fiberboard) consists of a fluted, wave-shaped sheet sandwiched between two flat linerboard sheets. This construction gives it exceptional strength and cushioning properties relative to its weight.

Types of corrugated fluting:

• A-flute — Thickest (5mm), best cushioning, used for fragile or heavy items


• B-flute — Medium (3mm), good crush resistance, common for shipping boxes


• C-flute — Most common (4mm), balanced strength and cushioning


• E-flute — Thin (1.5mm), smooth surface ideal for printed retail packaging


• F-flute — Very thin (0.75mm), used for small product boxes

When to use corrugated packaging:


• Shipping products via courier or postal services


• Heavy or fragile products needing cushioning


• Subscription boxes and e-commerce packaging


• Products that need to be stacked (the fluting provides excellent stack strength)

Single vs Double vs Triple Wall:


• Single wall — standard shipping cartons


• Double wall — heavy or valuable goods


• Triple wall — industrial shipping, very heavy items

For most e-commerce businesses, C-flute single wall corrugated is the go-to choice — it balances protection, print quality, and cost effectively.