An insert is whatever sits inside the box and stops the product being loose in it. That sounds minor and it is usually the difference between a package that arrives intact and one that does not, because most transit damage is caused by a product moving inside its own box rather than by the box failing.
The four common types
| Insert | Suits | Trade-off |
|---|---|---|
| Die cut corrugated fitment | Most products, especially flat or boxy shapes and multipacks | Cheap and recyclable, less cushioning than foam |
| Foam block or pad | Heavy, fragile or precision items that need real shock absorption | Best protection per inch, more cost and a material customers notice |
| Moulded pulp tray | Rounded shapes, bottles, cosmetics, electronics accessories | Holds curves well and looks clean; tooling suits longer runs |
| Paperboard platform or card | Light products presented face up, cables, small accessories | Very cheap and printable, minimal protection |
Movement is the enemy
Think about the three axes separately. A product can slide side to side, shift end to end, or lift and drop. An insert that grips two axes and ignores the third will still let the product hammer itself in transit. Fences and partitions handle the horizontal axes well. A lid pad, a foam cap or a fitted lift out tray handles the vertical one.
For fragile items, the useful question is not how much padding is there, it is where does the energy go. Suspension and retention designs hold a product away from every wall so an impact is absorbed by the structure rather than by the product. That is a design choice made at the insert stage, and it changes the box size, so it has to be decided early.
The insert is part of the dimension
This is the single most common sizing mistake. A tray with walls 1/4 in thick adds about 1/2 in to the internal length and the internal width, and a base pad adds to the depth. Size the box to the product plus the insert, or the insert will not fit the box you ordered. If you are specifying both at once, give us the product measurements and let the dieline for the box and the fitment be drawn together, because they are one design.
Presentation, not just protection
Inserts are also staging. What the customer sees when the lid comes off is decided by what the insert holds up and what it hides. A tray that presents the product first and buries the cable underneath tells a different story than a box where everything sits in a heap. Printed inserts are possible and a printed fitment can carry instructions where they cannot be missed.
Cost, minimum and lead time
The die is included on every order, which means an insert tool is not an extra line item in the way buyers often expect, and it is why cutting a fitment to your product is not more expensive than forcing it into a generic tray. The minimum is 100 boxes, from about $0.48 per unit at bulk volumes, confirmed on your written quote. Production is quoted per product in three lanes, rush (expedited production plus air freight), standard (air) and cost saver (sea), from about 7 business days, plus 2 to 5 for delivery, and specialty imported components can run up to about 12 weeks. Two plants, West Chicago and Guangzhou.
Send the product measured at its widest point and say how it should be presented when the box opens, and we will draw the fitment with the box on your quote request. If you are still setting the outer box size, single wall box dimensions explains how board caliper and insert walls stack up.
