Most transit damage is caused by movement, not by impact through the wall of the box. A product that cannot shift does not build momentum, does not hit a corner, and does not abrade its own finish. That is the whole argument for insert packaging, and it is why an insert is usually a better spend than a thicker outer box.
Material comparison
| Material | Fit precision | Notes |
|---|---|---|
| Corrugated fitment | Good | Folds from the same board family as the box, prints if you want it to, assembles by hand |
| Chipboard divider or platform | Good | Thin, neat for flat goods and multi cell layouts, less cushioning |
| Cut foam | Very high | Grips the product outline, absorbs shock, costs more and adds bulk |
| Moulded pulp tray | High | Cradles curved shapes such as jars and mugs, needs a tool, best at volume |
There is a fifth option people forget: change the box instead. A snug carton sized precisely to the product sometimes removes the need for an insert altogether, which is cheaper and faster to pack.
Getting the tolerance right
Fit tolerance is where inserts succeed or fail. Too tight and pack out slows to a crawl, or the operator forces the product and tears the fitment. Too loose and you have paid for an insert that still lets the product rattle. Three practical rules:
- Measure the largest example of your product you can find, not the average one. Glass, ceramic and moulded parts vary batch to batch.
- Board has thickness, so an insert eats internal space. A fitment inside a box adds its own caliper on every side it touches.
- Foam compresses and paper does not. A foam cavity can be cut close to the product; a corrugated cavity needs a little clearance or it will not accept the product at speed.
What an insert costs you
Three things, and it is worth being honest about all three. It needs its own die. It adds material. And it adds a step at pack out, which is a labour cost every single unit, not a one off. Against that, it reduces breakage claims and it changes how the product looks when the box is opened. If you are packing something fragile or something premium, that trade usually pays. If you are shipping a durable item in a snug box, it often does not.
Ordering and turnaround
The minimum is 100 units, and inserts are quoted alongside the box rather than as a separate order, because the two have to be designed together. Pricing starts from about $0.48 per unit at bulk volumes and is confirmed on your written quote. The die, the plates, design support, US shipping and a digital proof are included at no extra cost.
Turnaround is stated per product across three lanes: rush is expedited production plus air freight, standard is air, cost saver is sea. The floor is from about 7 business days plus 2 to 5 for delivery, and specialty imported items, which can include moulded and foam based fitments, run up to about 12 weeks. Rush adds about 7 to 25% depending on the job. Production runs at West Chicago in the US and Guangzhou in China.
Two common insert jobs are covered in more detail on custom candle boxes, where glass has to be held away from the corners. To get a fitment designed, send your product dimensions and how it should sit in the box through the quote form.
