How many kilos fit is decided by whichever of two limits fills first: internal volume or payload. Catalogues give volume in litres because the kilogram equivalent depends on the product's bulk density, meaning how much one litre weighs together with its packaging and the gaps between items.
- Weigh one carton or crate of your product and work out its litres from the outer dimensions; kilos divided by litres is the bulk density.
- Deduct the cold source from the internal volume: one 480 × 280 × 34 mm eutectic plate takes about 4.6 litres.
- Multiply the remaining volume by the density and compare the result with the container's payload; the smaller figure is the answer.
After the calculation, fill one container with the real product and weigh it once; this also shows the gaps left between crates and whether the door closes easily. Repeat the measurement whenever the product or its packaging changes.
