The short answer: the box you need is the size of your packed load plus the cushion you have decided it needs, stated internally, and nothing larger. Most people arrive at this question because an off-the-shelf size nearly fits. It is worth knowing that with a custom run you do not have to accept nearly.
The three questions that settle it
- What is the actual packed load? Not the product. The product plus its retail carton, the literature, the accessories, the invoice, and anything else that goes in. Build one and measure the block at its widest in each axis.
- What is protecting it? Loose fill, foam caps, a fitted insert, wrap. Every one of those has a thickness and that thickness is part of the internal dimension. Add it on each face it touches.
- How heavy is it and how high does it stack? Those two numbers, not the product category, decide the board grade. A light bulky item and a dense small item of the same footprint need different board.
Common situations and what usually governs
| What you ship | What usually sets the size |
|---|---|
| One retail-boxed item | The retail carton plus a consistent cushion on all six faces |
| A mixed order that varies unit to unit | The most common order profile, with a second size for outliers rather than one oversized box for everything |
| Something fragile | The protection, which usually adds more than the product does |
| Something dense and small | Board grade and a snug fit, because a heavy item in a loose box builds momentum before it hits the wall |
| Bulk into a distributor | The pallet. Tiling cleanly into a 48 x 40 inch footprint beats a box that is two inches wider and wastes a layer. |
The two mistakes worth naming
Oversizing to be safe. A box with two spare inches on each axis is billed on dimensional weight for the life of the product, and the extra void fill inside is a per-unit cost too. Carriers bill the greater of actual and dimensional weight, so an empty inch is not free.
Reading an external figure as internal. Corrugated board has real caliper, and double wall has a lot of it. A box advertised at your exact product dimension may be quoting the outside, in which case the product will not fit. Ask in writing.
What to send us
The internal dimension you calculated, or if you would rather not calculate it, the packed load dimensions and what you plan to protect it with. Plus the packed weight of one box and the stack height. That is enough for a written quote with a board grade attached.
Minimum order is 100 boxes and pricing starts from about $0.48 per unit at bulk volumes, confirmed on your written quote. The die, the plates, design support, US shipping and a digital proof before anything prints are included. We produce in West Chicago in the US and Guangzhou in China, and turnaround 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.
The full method, step by step, is on how to size a corrugated shipping box, and if the fit question is really a shipping cost question, read what dimensional weight is first.
Send your numbers through the quote form and we will confirm the internal dimension and price it in writing. If you are between two sizes, tell us both and we will price both.
