7 Ply Corrugated Box: When You Need a Heavy Duty Carton

Most ecommerce products ship fine in a 3 or 5 ply box. But some products, like glass bottles, heavy jars and tools, need more. That's where 7 ply comes in.

How ply works

Ply	Layers	Typical use
3 ply	2 liners + 1 flute	Light items under ~1 kg
5 ply	3 liners + 2 flutes	Most products, 1–5 kg
7 ply	4 liners + 3 flutes	Heavy, fragile or stacked items

More detail in corrugated box ply thickness.

When to use 7 ply

• Glass bottles of oil, ghee, honey or perfume.
• Products over about 5 kg.
• Parcels that travel long distances and get stacked in trucks.
• Items with a high value where a crushed box means a costly return.

Our 7-ply sizes

• 8 × 4 × 4 inch: single bottles, jars, small heavy items.
• 12 × 4 × 4 inch: tall bottles, tools, long items.

Narrow, tall boxes like these suit bottles well because there's little room for the product to shift.

Is 7 ply overkill?

For a T-shirt, yes. For a glass bottle, no. The price difference between 5 and 7 ply is usually far smaller than the cost of one broken order. Still wrap glass in bubble wrap inside the box.