The bottle, pump, label and formula have already been approved. Production has been running normally. Then the brand decides to move filling to another contract manufacturer or add a second manufacturing site.

At this stage, preparing plastic packaging for a new contract manufacturer may look simple because the packaging itself has not changed. In practice, the packaging handoff can create new problems if the new CM receives only a quotation, a few samples or a general instruction to use the same packaging as before.

The components may stay the same, but the filling line, capping equipment, labeling setup, inspection standards and packing process can all change. A good handoff therefore needs to protect the approved packaging specification while identifying which functions require testing again at the new site.

Why the Same Packaging Can Behave Differently at a New CM

Packaging performance does not depend only on the bottle or closure.

A different filling facility may use different capping heads, torque settings, pump insertion methods, label applicators, conveyor speeds, coding equipment and finished-goods packing procedures.

For example, a lotion pump may have worked well at the previous CM. The new CM may use a different method to insert and tighten the pump. A pressure-sensitive label may also run well on one labeling line but need a different roll direction or setup on another.

This does not mean the packaging needs to be redeveloped from the beginning. It means the approved packaging information needs to move with the project.

1. Transfer the Approved Packaging Version, Not Just the Latest Quotation

One common handoff problem starts when the new CM receives a commercial document but not the technical version that the brand actually approved.

A quotation can show the bottle size, unit price and quantity. It normally does not record every detail needed for filling and production.

The handoff information may need to include:

• Bottle material and capacity
• Neck finish
• Bottle weight where relevant
• Bottle and closure color
• Surface finish
• Pump or closure model
• Pump output
• Dip tube length
• Liner or induction seal requirement
• Decoration specification
• Label version and position
• Approved component combination
• Carton packing method
• Current revision or version number

If the project does not yet have a controlled specification, it is worth building one before the transfer. Our article on how to build a plastic packaging specification sheet before production explains what information is useful to record.

2. Send the Complete Packaging Combination to the New CM

Do not test the bottle, pump, cap or liner as isolated parts when the final product uses them as one system.

If the final pack is a PET bottle with a lotion pump and overcap, send that complete combination. If the project uses a screw cap with an induction liner, the CM needs the actual cap and liner configuration.

This is especially important when components come from different molds or suppliers. Two parts may share the same nominal neck specification and still perform differently when assembled.

For more detail, see our guide to avoiding plastic packaging component mismatch before filling.

3. Use the Correct Samples for the New CM Line Trial

An old development sample is not always the right sample for a new CM trial.

The safest approach is to identify which version represents current production. Then send enough units for the CM to evaluate the actual filling and packaging process.

The required quantity depends on the project and the line. One assembled sample may help with visual review, but it cannot represent a production-line test.

Each sample shipment should clearly identify the version. Avoid mixing early development samples, color samples and final production samples without clear labels.

We covered this in more detail in how to avoid plastic packaging sample mistakes before testing.

4. Recheck the Packaging on the New Filling and Packing Line

Even when the packaging specification stays unchanged, some functions depend on the equipment at the new site.

The CM may need to evaluate:

• Bottle stability on the conveyor
• Filling nozzle access
• Fill level
• Closure or pump insertion
• Capping torque
• Pump tightening
• Label application
• Lot or date coding position
• Vision or sensor detection
• Finished product packing

These are line-dependent checks. They do not automatically mean the packaging design has a problem.

The purpose of the trial is to identify where the new process needs adjustment before a full packaging order or filling run begins.

5. Reconfirm Pump and Dip Tube Setup Where Necessary

Pump packaging needs extra attention during a CM transfer because the pump may arrive separately from the bottle and require assembly or tube trimming before filling.

Confirm the approved pump model, dosage and dip tube length. If the new CM plans to trim tubes locally, provide a controlled reference instead of asking the line team to estimate the length from bottle height.

The team should also verify priming and dispensing with the actual formula.

Our article on pump output and dip tube length before filling explains why bottle height alone is not enough to determine the final tube setup.

6. Recheck Labeling Requirements on the Actual CM Equipment

The approved label artwork may stay exactly the same while the physical application setup changes.

Ask the new CM to confirm the requirements of its labeling equipment before the brand orders a large quantity of labels.

Depending on the line, the CM may need information about:

• Label roll direction
• Unwind orientation
• Label position
• Gap between labels
• Sensor requirements
• Bottle orientation
• Usable label area
• Application speed

The actual bottle surface also matters. A curved or tapered area can create different application results from a straight panel.

For physical label application issues, see how to avoid plastic packaging labeling problems before production.

7. Define Who Approves What

A packaging handoff becomes difficult when the supplier, brand and CM each assume another party has approved a detail.

The exact responsibilities vary by project, but it helps to separate them clearly.

Packaging Supplier

• Confirm component specifications
• Provide the correct sample version
• Confirm decoration and component production details
• Maintain packaging revision records
• Confirm packing method for shipment to the CM

Brand Owner

• Confirm the commercial packaging version
• Approve appearance, color and artwork
• Coordinate decisions between supplier and CM
• Approve any requested packaging changes

Contract Manufacturer

• Evaluate filling-line compatibility
• Confirm capping and assembly requirements
• Confirm labeling-line requirements
• Run formula and filled-pack testing as required
• Confirm finished-goods packing requirements

A short approval matrix can prevent many later questions, especially when several packaging components come from different sources.

8. Treat CM-Requested Packaging Changes as Controlled Changes

A new CM may ask for a different pump, another dip tube length, a revised label direction or a different packing method because it works better with its equipment.

Some requests are reasonable. The risk comes from changing the specification without checking the effect on the rest of the packaging system.

For example, changing the pump can affect output, priming, dip tube length, appearance and transport performance. Changing a label orientation can require new label stock or artwork preparation.

Record the proposed change, review its effect and approve the new version before bulk production. Our guide to controlling plastic packaging change requests during production explains how to manage this process.

What Does Not Need to Be Final Before You Involve the Packaging Supplier?

Brands do not need to complete the entire CM transfer before discussing the project with the packaging supplier.

The following information can still be open when the discussion starts:

• Final filling date
• Exact production schedule
• Final line speed
• Some machine settings
• Final packaging delivery schedule
• Whether minor line adjustments will be necessary

What matters first is knowing which packaging version is current, which CM will fill it and what parts of the process are changing.

With that information, the supplier can help prepare samples, specifications and component details for the new CM review. This is often more efficient than waiting until the filling date is close and then discovering that additional samples or technical information are needed.

Practical Packaging Handoff Checklist

Before transferring an existing packaging project to a new contract manufacturer, confirm the following:

• Current approved bottle or jar specification
• Current approved closure, pump or sprayer
• Neck finish and component compatibility
• Pump output and dip tube length where applicable
• Liner, seal or overcap requirement
• Approved colors and decoration
• Current label version
• Representative approved samples
• Required sample quantity for CM testing
• Filling-line and capping-line requirements
• Labeling equipment requirements
• Packaging revision number
• Who approves CM-requested changes
• Bulk packaging delivery address and schedule
• Carton and incoming inspection requirements

When Should the Packaging Supplier Become Involved?

Ideally, involve the packaging supplier before the new CM runs its final packaging trial and before the brand orders another bulk production lot.

This gives all parties time to confirm samples, specifications and any line-specific requirements without changing an already released production order.

The supplier does not need every CM machine setting to start. A current packaging specification, the project status and the new CM’s main requirements are usually enough to begin the technical handoff.

Final Thought

Moving an existing product to a new contract manufacturer does not mean restarting the packaging development process.

The goal is to protect what has already been approved and retest the parts that depend on the new manufacturing environment.

A controlled packaging handoff gives the new CM a clear reference, gives the supplier a clear production target and helps the brand avoid last-minute decisions before filling.

FAQ

Do we need to test the packaging again if the bottle and closure have not changed?

Usually, the new CM should still check line-dependent functions such as filling, capping, pump assembly, labeling and finished-pack handling. The components may be unchanged, but the manufacturing equipment and process may differ.

Are approved packaging samples enough for the new contract manufacturer?

Samples are useful, but they work best together with a controlled packaging specification. Samples alone may not show pump output, material, dip tube length, approved color reference, liner requirement or revision history.

Can the packaging supplier ship components directly to the new CM?

Yes, if the project structure allows it. Before bulk shipment, confirm the receiving address, carton requirements, inspection responsibility, delivery schedule and the exact packaging version the CM expects.

What if the new CM asks to change a pump, label direction or other packaging detail?

Treat the request as a controlled packaging change. Review how it affects component compatibility, dispensing, artwork, production and testing before approving the new version.