The total cost of custom-printed food packaging depends not only on unit price but also on the volume and damage rate at which it reaches the customer’s warehouse. An oversized case transports empty space; an over-tight case can crush creases and locks; a load overhanging the pallet is exposed to impact. In export shipments, a few centimetres of carton size can change vehicle or container utilisation and freight cost per unit. This guide brings units per case, pallet pattern, load stability and cube calculations into one logistics plan for burger boxes, cups, kraft bags, greaseproof paper and other custom packaging. The methods are for planning; final carton, pallet and transport values should be validated with real samples and actual logistics conditions.
Start carton design with the product’s shipping form
The first question is not the outer case size but how the packaging will travel. Unassembled boxes may ship flat; glued boxes need support around locks and creases; nested cups must retain their rim shape. For greaseproof sheets and napkins, bundle compression, edge protection and moisture protection become more important.
Mark the shipping form, sensitive faces and permitted pressure on printed surfaces, then set the inner-pack or bundle count. A carton should not only transport the product; it should simplify counting, open in the correct warehouse orientation and move to the customer’s service station without unnecessary repacking.
- Flat, glued or nested shipping form
- Sensitive creases, locks and printed faces
- Inner-pack and bundle count
- Warehouse opening and counting direction
Balance units per case between empty space and compression
A large case with too few units carries air and void fill; an over-tight case may curl product edges, rub the print and make the carton bulge. The best case count comes from a packing trial with the product’s actual thickness. Multiplying the theoretical blank thickness by quantity does not account for production and packing variation.
Fill the trial case at normal packing speed, close it, reopen it and count it several times. Packs should pull out without force, remain upright without excessive movement and allow the flaps to close without bowing. Record internal and external dimensions separately: freight uses the external cube, while product fit depends on usable internal space.
- Packing and counting trial with real products
- Side, top and corner void checks
- Print rub and carton bulge observation
- Separate internal and external dimensions
Test carton strength under the real pallet load
A single case that feels strong by hand may not withstand hours or days in the bottom layer. Flute, paper quality, case orientation, humidity, stack height and load transfer across the pallet work together. Deformation in lower cases can damage creases and locks on the custom packs inside.
Build a trial stack at the planned height and holding time. Check whether weight transfers through carton corners, layers remain aligned and the top surface stays level. Stretch film or strapping should stabilise the load without collapsing cases; record the result with photographs and measurements.
- Trial stack at planned shipment height
- Bottom-layer deformation and product check
- Corner alignment and load transfer
- Stretch, strap and corner-board setting
Build the pallet pattern around overhang, voids and balance
Dividing case dimensions into the pallet footprint and looking only at units per layer can be misleading. Rotating rows may improve footprint use, yet can break vertical column alignment and reduce compression performance. The chosen pattern must balance base utilisation with a reliable vertical load path.
No case should overhang the pallet, while an excessively recessed pattern wastes usable area. Overall height must suit warehouse racking, vehicle doors, container clearance and handling equipment at destination. Product codes and carton labels should remain readable from the outer faces of the pallet.
- Pattern trials in multiple case orientations
- Stable edge allowance without overhang
- Column alignment and layer stability
- Carton labels readable from outside
Measure freight per product, not only per carton
A freight quotation may be based on actual weight, volumetric weight, pallet spaces or vehicle cube. A price per carton alone cannot compare alternative packing formats. For each scenario calculate external case volume, units per case, cases per pallet, units per pallet and total units per shipment.
Add damage and replacement risk to the comparison. A thinner case may save a few centimetres but increase total cost if the crush rate rises. The best solution is not the smallest possible box; it is the format that delivers the lowest storage and freight burden per usable unit at an acceptable protection level.
- External carton cube and gross weight
- Cases and units per pallet
- Vehicle or container utilisation
- Freight and damage cost per usable unit
Use the first shipment as a logistics validation batch
A trial pallet before full-volume shipping shows how the desk calculation performs in practice. Forklift entry, pallet movement, passage through doors, vehicle restraint and unloading at destination should all be observed. Take photographs not only at dispatch but also at the customer’s warehouse before removing stretch film.
Record damaged-case location, direction of movement, crush level and internal product condition so the next shipment can be corrected with evidence. Saving carton size, units per case, pallet pattern and total height as a shipping specification makes logistics performance more consistent on repeat orders.
- Trial pallet and loading photographs
- Vehicle restraint and void control
- Arrival record before unwrapping
- Approved carton–pallet specification and revision