Co-packing: buying the step between bulk product and a retail-ready case

What a co-packer is actually selling

The service is presentation rather than creation. Bulk liquid becomes filled bottles, loose units become shelf-ready cases, separate items become a multipack, a gift set or a display shipper. Many sites also handle rework: relabelling stock for a different market, replacing a damaged outer, breaking a pallet into store-level cases. Since the product already exists, the contribution is measured in throughput, changeover speed and accuracy rather than in formulation skill. That shapes the commercial conversation, which is really about machine hours, labour and component handling. Quotations move sharply with how fiddly the format is and far less with how much product passes through.

Components are the constraint, not the equipment

A packing run cannot start until every piece is present: containers, closures, labels, cartons, inserts, tape, pallets and whatever the retailer wants on the outer. These come from different suppliers with different lead times, and the slowest sets your date. One missing item idles a booked line and is charged regardless. Sites differ in whether they will procure components on your behalf, and the answer matters. Site-bought components simplify coordination and carry margin; buyer-supplied components keep cost visible and put assembly of the complete kit on your desk. Either way someone must own a readiness check before the slot is confirmed.

Artwork is the commonest cause of a scrapped run

Labels and cartons are printed against a version, and versions multiply: a legal correction, a weight change, a new market, a promotional flash. Printing the superseded version, or mixing two versions inside one case, produces stock that cannot be sold and rarely justifies reworking. The controls are unglamorous. One approved master per component, held by one named person. Version codes printed visibly on the item itself. A physical check of the first pieces coming off the line against that master before the run is released. Sites will follow this if asked and will not invent the discipline on a customer's behalf.

Promotional formats are a different business from base packs

A banded pair, a seasonal sleeve, a retailer-exclusive display or a sample attached to a bottle brings manual handling, temporary tooling and often a separate area of the floor. Unit costs rise steeply, timing is dictated by the retailer rather than by you, and leftover promotional components have no second life once the window shuts. Treat this as a project with its own quotation and its own decision about residual stock, not as a variation on the standing order. The characteristic loss is not the packing charge; it is the pallet of dated sleeves that nobody could subsequently use.

Reconciliation: what went in, what came out, and the gap

Where you supply bulk product and components, every run finishes with a count: input quantity, output cases, damaged components, product left in lines and hoses, and the difference between them. Allowances for that difference belong in the agreement before the first run and should be stated by component type, since closures and labels are lost at different rates from cartons. Without a written allowance the discussion turns adversarial the first time a count comes up short. Settle too what becomes of residual bulk and surplus components afterwards: returned, stored at a charge, or destroyed with the cost landing somewhere nobody expected.

Frequently asked questions

Who supplies the packaging components in a co-packing arrangement?

Either party can, and the choice has consequences. Buying them yourself keeps cost transparent, protects specification and lets you keep existing print suppliers, but makes you responsible for assembling a complete kit on site by the booked date. Letting the packer buy transfers that coordination and adds handling margin, along with dependence on their supply base. Mixed arrangements are usual, with the brand providing printed items and the site supplying commodity outers and consumables.

Why are we being charged for a changeover we did not ask for?

Because your run sits between two other products, and the line has to be emptied, cleaned and reset around it. That time produces nothing and somebody pays for it. Short runs carry proportionally more of it, which explains why an identical job costs far more per unit in small quantities. The charge falls when formats are grouped, when related variants run consecutively, and when repeating slots let the site plan a sequence rather than squeeze you in.

Can a co-packer build a retailer-specific display unit for us?

Most can, and the limits are structural rather than operational. The unit has to survive transport fully loaded, satisfy the retailer's footprint and presentation rules, and be assembled at a labour cost the promotion can carry. Obtain the retailer's specification and get a physical prototype through a transit trial before committing to printed components, because a display that collapses after cartons are printed is an expensive lesson the trade repeats every season.