3-Ply vs 5-Ply Corrugated Box: Which Should You Use?
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When you buy corrugated boxes, the first choice is usually 3-ply or 5-ply. Pick too weak and products get damaged in transit; pick too strong and you overpay for every box. Here is a simple guide to choosing the right one.
What does "ply" mean?
"Ply" is the number of paper layers in the corrugated board.
- 3-ply = 2 flat liner sheets + 1 wavy fluted layer in between.
- 5-ply = 3 flat liner sheets + 2 fluted layers. It is thicker, stiffer and stronger.
More layers mean more strength and more cushioning, but also more weight and higher cost per box.
3-ply vs 5-ply at a glance
| 3-ply box | 5-ply box | |
|---|---|---|
| Strength | Good for light and medium items | High, for heavy or fragile items |
| Box weight | Light, keeps shipping cost low | Heavier |
| Cost | Lower | Higher |
| Stacking | Fine for normal courier handling | Better for stacking in warehouses and long-distance freight |
| Best for | Clothing, cosmetics, jewellery, accessories, books, small electronics, e-commerce orders | Glass, ceramics, machine parts, heavy bulk items, large appliances, export cartons |
As a rough guide, most e-commerce parcels are well served by 3-ply boxes. Move to 5-ply when the contents are heavy, fragile, or will be stacked and moved many times. Actual strength also depends on paper quality and box size, so for heavy products it's worth testing a sample first.
When 3-ply is enough
- Your product is light to medium weight.
- It ships by courier directly to the customer.
- It isn't easily breakable, or it's wrapped in bubble wrap.
Our corrugated mailer boxes, brown carton boxes and white corrugated boxes are all 3-ply, which is the right choice for most online sellers.
When you should use 5-ply
- Heavy items, or many items packed in one carton.
- Fragile goods like glass, ceramics or bottles.
- Master cartons that carry many smaller boxes.
- Goods that go through warehouses or long transport routes with stacking.
KNS Packaging makes 5-ply boxes on request in the size you need. Contact us with your product size and weight for a quote.
Don't forget box size
A strong box that's too big still costs you, because couriers charge by volumetric weight. Use the smallest box that fits with padding. Check the numbers with our volumetric weight calculator.
