Nobody orders a bird seed box by dimension. They order it by weight: a two pound pack, a five pound pack, a twenty pound sack replacement. The dimension falls out of the weight once you know how much room your particular mix takes up, and that is a number you have to measure, because a sunflower heavy mix and a millet heavy mix do not fill the same space at the same weight.
Work out your own fill volume
- Take a container of known internal volume. A one gallon jug, a measuring pitcher, anything you can calculate.
- Fill it with your seed mix, settle it the way a filling line settles product, and level the top.
- Weigh the contents. Weight divided by volume is your bulk density.
- Divide the pack net weight by that density. The result is the volume the seed needs.
- Add headspace. A box filled to the brim will not close cleanly and will burst at the seams if it is dropped, so plan for a margin above the settled fill line.
With the required volume in hand you can choose a footprint. A taller, narrower carton is easier to pour from and stacks densely. A shorter, wider one is more stable on a shelf and less likely to topple. Both can hold the same volume, so pick on merchandising and then confirm the internal dimensions on the drawing.
The box has to survive a dense load
| Decision | Light packs | Heavy packs |
|---|---|---|
| Board | Folding carton or E flute | Corrugated, single wall at minimum, double wall for the heaviest |
| Bottom | Tuck or crash lock | Auto bottom or a glued, reinforced base |
| Liner | Often none | Poly or foil inner bag to control dust, oil and pests |
| Closure | Simple tuck | Tuck plus a seal, or a glued top after filling |
Liners, oils and dust
Seed mixes carry oil, and oil migrates into uncoated board over time. They also carry fines, which escape through any seam that is not sealed. An inner liner bag solves both and is usually cheaper than upgrading the board to compensate. If you are going liner free, say so at quote stage so the coating and board can be chosen with that in mind rather than discovered after a shelf test.
What to state when you ask for a price
Net weight per pack, measured bulk density or the fill volume you calculated, whether there is a liner, whether the pack is retail or ecommerce, and the case count and pallet pattern if you have one. That set of five is enough to quote a board grade and a dieline without guesswork.
Minimum, price and lead time
The minimum is 100 units. Pricing runs from about $0.48 per unit at bulk volumes, confirmed on your written quote. Three turnaround lanes are quoted per product: rush, which is expedited production plus air freight and carries a premium of roughly 7 to 25 percent depending on the job, standard on air, and cost saver on sea. The floor is about 7 business days in production plus 2 to 5 days for delivery. The die, the plates, design support, US shipping and a digital proof are included.
For the pet aisle equivalent of this problem, the dog food box guide covers liners and legal panel space in more depth. When you have your fill volume, send it with a quote request and we will size the carton around it.
