Haihui Eastern editorial team · Published 2026-10-13 · Reviewed 2026-10-13
Which capacity should a buyer specify?
Start with the working fill: the quantity of contents you intend to put into each complete pack, with its unit and filling conditions. Then ask the supplier to identify the actual body, matching closure and measured capacity. A photograph, printed retail weight or a nominal size alone cannot confirm that your fill will fit.
For example, a brief for a sauce filled by mass needs its density at the intended filling condition before a volume can be estimated. A powder brief may need the relevant bulk density and filling behavior. Avoid replacing those measurements with a water assumption. The calculation above uses only the density you enter.
Keep nominal size, working fill and brimful volume separate
A supplier’s published catalogue can show nominal and brimful values as separate fields. The Cambrian Packaging food-sector catalogue is one such external example. Its model data are not Haihui Eastern specifications, and one model’s relationship between those values is not a conversion rule for other containers.
Scroll across to compare all columns.
| Quantity | What it means in the brief | Evidence to request |
|---|---|---|
| Nominal / named capacity | The size designation quoted for the proposed model; clarify its basis rather than assuming it is your usable fill. | A named model and drawing with the capacity definition, unit and revision. |
| Working fill | Your target contents quantity at the agreed process state, allowing for the complete closure and operation. | A filling-line or agreed sample trial with your contents, target fill and closing conditions. |
| Brimful capacity | A measured volume to the rim under specified measurement conditions; it is not a recommendation to fill to that level. | The measurement method, applicable conditions and the capacity / tolerance stated for that model. |
| Free-volume allowance | Extra space requested for the application; there is no universal percentage supplied by this worksheet. | An agreed fill level and closure clearance, then the relevant filled-pack checks. |
Convert mass with the right density
Mass and volume are different quantities. With mass expressed in kilograms and density in kg/L, contents volume in litres is mass divided by density. The density should describe the contents as filled, including the relevant temperature and physical state; a different formulation or aeration state can change the useful input.
An illustrative calculation is 12 kg divided by a buyer-supplied 1.2 kg/L, giving 10 L of contents. These are example inputs, not a container model, a measured product density or a recommendation for your formula. The selected pack still needs room for the closure, an agreed fill level and the intended operation.
The helper keeps your extra free-volume allowance separate. If you enter one, it also shows the combined project target. That sum does not measure a real container’s brimful capacity, account for all closure intrusion or verify a carrying load.
Specify the gallon system and the unit
A litre is 1,000 millilitres. US liquid and Imperial gallons have different litre values, so “5 gallon bucket” is an incomplete volume brief unless the gallon system is stated. The helper labels both systems and uses the NIST published conversion factors; its US factor is rounded.
Keep the original quantity and unit alongside the converted litre value in the enquiry. The helper presents rounded results for communication, not a laboratory measurement. Use an appropriate measurement method and the approved drawing when accepting a physical sample.
Check the complete container, not volume alone
Two packs with similar volume can have different opening geometry, rim design, outside height and lid fit. Round IML buckets require a diameter and carrying-envelope review. Square or rectangular pails also require the outside footprint, corner geometry and facing orientation. IML tubs need the opening / flange and matching closure checked against the filling line.
Artwork does not establish capacity or intended-use suitability. Confirm the proposed body / lid references and decoration construction together. A change in closure, insert or body geometry may require a new fill review even when the named size stays the same.
What to include in the capacity enquiry
- Contents and intended use, target quantity, original unit and any measured density used for a mass-based calculation.
- Filling method, temperature / physical state, opening clearance and any fill-height requirement.
- Body, lid, seal, insert and handle needs; complete outside-envelope limits where relevant.
- Any requested free-volume allowance, marked open if not yet agreed.
- Quantity per artwork, destination, sample requirements and the drawing / approval record you need.
- Ask the supplier to state nominal and brimful definitions, capacity measurement conditions, the complete assembly and any model-specific tolerances.
Purchasing questions
Does a nominal 10 L bucket guarantee a 10 L working fill?
Confirm the exact model, the meaning of its stated capacity, the complete closure and your filling conditions. A named size alone does not establish usable fill or an agreed fill level.
Can the helper convert kilograms without density?
No. The helper requires a positive contents density in kg/L for a mass input. If density is unknown, send the original mass, contents and filling conditions in the enquiry and request a sample-based review.
Does the combined volume target become a brimful specification?
No. It is the calculated contents volume plus the extra free volume you entered. A real model’s brimful volume, measurement basis, closure clearance and filling suitability still need confirmation.
Will this select an available product or set MOQ?
No. It normalizes your requirements and carries them to the quotation. SKU, dimensions, material, MOQ, sample terms and lead time are confirmed separately for the proposed model.
Sources and further reading
- NIST SP 811, Appendix B.9 — volume conversion factors
- BIPM — The International System of Units (SI Brochure)
- Cambrian Packaging — external food-sector catalogue with separate nominal / brimful fields
General purchasing guidance does not replace the approved model drawing, test results or order terms.