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What Is a Flat-Pack Box? Carton and Corrugated Self-Assembly Box Cost
What is a flat-pack box and how does it differ from a rigid box? Choosing carton or corrugated, the flat-shipping advantage, and the cost lines that set its price.
Quick answer
A flat-pack box is cut as a single blank from folding carton or corrugated board, usually shipped flat and assembled by hand where it is used. It does not go through a gluing machine; its corners fold and lock together. It should not be confused with a paper-wrapped rigid box.
A flat-pack box is cut from folding carton or corrugated board, usually shipped flat, and assembled by hand where it's used. It doesn't go through a gluing machine; its corners fold and lock into each other. In Turkish it's called a "kurmalı kutu", and it's often confused with a paper-wrapped rigid box. The two are different products, made from different materials, and priced on different cost lines.
- A flat-pack box is made from folding carton or corrugated board, ships flat and is assembled by hand by the customer.
- It shouldn't be confused with a rigid box, which is paper-wrapped and arrives assembled.
- Material, print and cutting set the price; if assembled delivery is wanted, assembly labour is added.
What is a flat-pack box, and how is it different from a rigid box?
A flat-pack box is cut from a single blank. The walls and corner tabs fold into place, so the box takes shape without glue. Lid-and-base models, with a separate lid over a tray, can also be made this way; the tray and lid are then cut and assembled separately.
- Folding carton or corrugated board
- Single material, no paper wrapping
- Ships flat, assembled where it's used
- Paper wrapped over a board body
- Two materials plus wrapping labour
- Made and shipped assembled
Flat shipping is the flat-pack box's biggest advantage. Shipped assembled, it would take up as much space in transport and storage as a rigid box. That's why most of these boxes go out flat.
Folding carton or corrugated board?
Most flat-pack models can be made from either folding carton or corrugated board. The choice depends on what the box has to carry.
| Material | Construction | Suitable use |
|---|---|---|
| Folding carton | Single layer | Light products, display, outer packaging |
| Corrugated board | Fluted middle layer | Heavy products, transport and shipping |
This is where orders most often go wrong. If a sturdy shipping box is expected but a carton box is ordered, what arrives is a single-layer carton box that won't protect the product in transit. Stating the product weight and what the box is for when you ask for a quote means the right material gets recommended. Carton thickness comes from grammage, and corrugated strength from the flute type.
What drives the price?
| Cost line | Impact | Note |
|---|---|---|
| Material | High | Carton grammage or corrugated flute; one material |
| Varies with quantity | Offset plates and tooling are fixed and spread over the run | |
| Cutting | Medium | The blank is die-cut; the die is a one-off cost on the first order |
| Finishing | Low to medium | Lamination, varnish |
| Assembly labour | Depends on delivery | Flat: the customer assembles, not in the price; assembled: added |
| Freight | Low | Small volume, since it ships flat |
The key difference from a rigid box shows up here: there's no wrapping labour and no second material. Assembly also moves to the customer when the box ships flat. So it's clearly more economical than a rigid box of the same size.
To make set-up easier, some models can be produced glued and partly assembled. Assembly gets simpler, but gluing adds to the cost and this construction doesn't suit every model.
You can check the carton and shipping side of a flat-shipped box with the shipping weight calculator.
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Try FreeWhat should you specify when asking for a quote?
- Give the inside dimensionsThe space the product needs: width, length and height.
- State the product weight and useShipping, display or outer packaging. This decides carton versus corrugated.
- Say whether it has a lidFor a lid-and-base model, add how far the lid should cover the tray.
- Separate print and finishingHow many colours, on which faces; whether lamination or varnish is needed.
- Specify deliveryFlat or assembled. Assembled delivery adds assembly labour to the price.
Frequently Asked Questions
What is a flat-pack box?
What is the difference between a flat-pack box and a rigid box?
Should a flat-pack box be carton or corrugated?
What sets the price of a flat-pack box?
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