Oct 22, 2026Case studies
Magnetic Box Size Mismatch: A Custom Packaging Case Study
Discover how Cherubox addressed a magnetic box size mismatch by adjusting inner packaging dimensions and planning cost-conscious shipping solutions.
Custom Packaging Case Study: Solving a Magnetic Box Size Mismatch Without Remaking the Outer Boxes
When multiple packaging components are designed to fit together, even a small dimensional mismatch can create a costly problem.
For brands using custom magnetic boxes, folding cartons, and multi-pack packaging, every component must work as part of a complete packaging system. If the outer box and inner boxes do not fit correctly, the result may include unusable inventory, additional production costs, and unexpected shipping delays.
At Cherubox Packaging, we recently worked with a long-term customer facing this exact challenge. Rather than remaking an entire batch of completed magnetic boxes, we explored a more practical solution: adjusting the smaller inner boxes to fit the existing outer packaging.
This case study explains the problem, the corrective approach, and the lessons brands can apply to future custom packaging projects.
The Challenge: Inner Boxes Did Not Fit the Magnetic Outer Boxes
Our customer had ordered two packaging components designed to work together:
- Custom magnetic rigid boxes: Larger outer boxes intended to hold multiple smaller packages.
- 10-pack inner boxes: Individual packages designed to fit inside the magnetic outer boxes.
The magnetic boxes had already been manufactured. However, after the customer received the packaging components, they discovered that the smaller inner boxes did not fit correctly inside the larger boxes.
This created an unexpected problem. The customer had already invested in the completed packaging, and replacing the outer boxes would require additional production time and cost.
The challenge was not simply to correct the dimensions. We also needed to consider how to minimize additional expenses and help the customer manage inventory requirements.
Why Packaging Size Mismatches Can Be Expensive
When packaging components are manufactured separately, dimensional compatibility becomes especially important.
A mismatch may result from differences between design files, structural revisions, assembly tolerances, or assumptions about internal and external dimensions.
For this project, the immediate concerns included:
- Completed magnetic boxes that could not be used as intended.
- Additional production costs to correct the packaging dimensions.
- Potential material waste if finished boxes had to be replaced.
- Inventory disruption while waiting for corrected packaging.
- Additional freight costs and delivery scheduling challenges.
Rather than immediately reproducing the larger boxes, we reviewed which packaging component could be adjusted more efficiently.
Our Solution: Adjust the Inner Boxes Instead of Remaking the Magnetic Boxes
The key decision was to preserve the existing magnetic boxes wherever possible.
Since the larger rigid boxes were already completed, remaking them would involve substantial additional materials, manufacturing work, and transportation costs.
We therefore evaluated whether the smaller 10-pack boxes could be resized to fit the available internal space.
Step 1: Review the Existing Packaging Dimensions
The first step was to compare the completed magnetic boxes with the dimensions of the inner packaging.
This review focused on:
- Available internal dimensions of the magnetic box.
- External dimensions of the 10-pack inner boxes.
- Space required for loading and removing the inner boxes.
- Structural allowances created by paperboard thickness, folds, and assembly.
- Whether the revised dimensions could maintain the required packaging function.
For multi-component packaging, checking only the nominal length, width, and height is not always sufficient.
The actual assembled dimensions must also be considered, especially when several smaller boxes need to fit inside one rigid box.
Step 2: Revise the Smaller Inner Box Dimensions
After reviewing the dimensional requirements, we proposed modifying the smaller inner boxes instead of replacing the completed magnetic boxes.
The revised inner box dimensions were specified as:
72 × 177 × 122 mm
This approach was intended to make the smaller boxes compatible with the existing outer packaging while preserving the original magnetic boxes.
By focusing the correction on the smaller packaging component, we could avoid restarting production of the more substantial rigid boxes.
Why This Approach Made Sense
Adjusting the inner packaging offered several practical advantages:
- Preserving existing inventory: The completed magnetic boxes could remain part of the packaging solution.
- Reducing unnecessary reproduction: The correction could focus on the smaller packaging component.
- Limiting additional material use: Fewer packaging components would need to be replaced.
- Supporting a faster recovery plan: The revised inner boxes could be prioritized according to the customer's inventory requirements.
The most important lesson is that a packaging mismatch does not always require replacing every component.
Sometimes, reviewing the complete packaging structure reveals a smaller and more practical adjustment.
Cost Optimization: Supporting a Long-Term Customer
Correcting a packaging problem can create unexpected financial pressure, particularly when the original packaging has already been manufactured and shipped.
For this project, we also considered the customer's additional production costs.
As part of our long-term working relationship, Cherubox offered pricing support for the revised inner box order.
Our objective was to reduce the customer's additional financial burden while maintaining the necessary packaging specifications.
This situation illustrates an important principle in custom packaging procurement:
The lowest-cost corrective solution is not always the one that changes the fewest dimensions. It is the solution that considers the total cost of production, materials, existing inventory, and transportation.
For example, remaking a large rigid box may involve significantly different production and shipping costs than adjusting a smaller folding carton.
Evaluating the full packaging system can help buyers make a more informed decision.
Flexible Shipping: Combining Air Freight and Sea Freight
Production correction was only one part of the challenge.
The customer also needed to manage inventory availability while avoiding unnecessary transportation expenses.
Shipping the entire revised order by air could increase freight costs. Shipping everything by sea could extend the time before replacement packaging became available.
We therefore considered a combined shipping strategy.
Air Freight for Urgent Inventory Needs
A portion of the revised inner boxes could be prioritized for air freight.
This approach would allow the customer to receive part of the corrected packaging sooner and support more immediate packaging requirements.
Although air freight generally costs more per unit than sea freight, it can be useful when a limited quantity is needed urgently.
Sea Freight for the Remaining Quantity
The remaining boxes could be allocated to sea freight to help control transportation expenses.
This approach balances two competing priorities:
- Receiving urgent packaging quantities sooner.
- Managing the freight cost of the remaining bulk order.
For brands facing a packaging correction or unexpected inventory shortage, splitting shipments can be a practical alternative to choosing only one transportation method.
However, the best arrangement depends on shipment volume, destination, available transit options, and actual inventory deadlines.
What Brands Can Learn From This Packaging Case
This project highlights several lessons for businesses ordering custom packaging with multiple components.
1. Treat Multi-Component Packaging as One System
If a magnetic box must hold ten smaller boxes, the dimensions of each component cannot be evaluated independently.
The outer box, inner boxes, inserts, dividers, and other structural elements must work together.
Before production, confirm:
- The actual internal dimensions of the outer packaging.
- The assembled external dimensions of the inner packaging.
- The intended arrangement and orientation of all components.
- Sufficient clearance for loading and removal.
- Whether the packaging remains secure during normal handling.
A box that looks correct in a drawing may still create assembly problems if the complete packaging system has not been tested.
2. Confirm the Latest Dieline Before Production
Packaging structures often change during product development.
A supplier may adjust a dieline to improve assembly, accommodate a material change, or meet updated product dimensions.
If different packaging components are produced using different versions of the structural drawings, dimensional compatibility can become a problem.
Before approving production, make sure all parties are working with the latest confirmed dielines.
3. Test the Complete Packaging Assembly
A sample of an individual box may look perfect but still fail when combined with other packaging components.
For multi-pack packaging, the approval process should include a complete assembly test.
Place the actual inner boxes into the outer box and check the fit, clearance, closure, and ease of removal.
Whenever possible, use physical samples made with production-representative materials and construction.
Our 7 Things to Check Before Approving Your Custom Packaging Sample explains additional details to review before mass production.
4. Evaluate Alternatives Before Ordering a Full Remake
When a packaging problem occurs, replacing the entire order may seem like the most straightforward solution.
However, it is worth evaluating other possibilities first.
Could an insert be modified? Could a smaller internal component be resized? Could an alternative arrangement improve the fit?
Not every packaging problem can be solved through a minor adjustment, but reviewing these options may reduce unnecessary costs and material waste.
5. Include Logistics in the Corrective Plan
Production cost is only part of the total expense.
If corrected packaging must be shipped internationally, transportation costs and delivery timing can significantly affect the project.
A combination of air and sea freight may help balance urgency and cost, particularly when the customer does not need the entire order immediately.
For additional cost-management strategies, see our 7 Ways to Reduce Custom Packaging Costs Without Sacrificing Quality.
Why Packaging Coordination Matters
Custom packaging involves more than printing and manufacturing individual boxes.
For projects with multiple packaging components, successful execution also requires dimensional coordination, design review, supplier communication, quality checks, and logistics planning.
At Cherubox Packaging, we help brands and wholesale buyers manage these considerations across their custom paper packaging projects.
Our support includes:
- Packaging structure review: Evaluating dimensions, assembly requirements, and compatibility between packaging components.
- Material and finishing guidance: Helping buyers select appropriate paperboard, printing, and surface finishes.
- Cost-conscious problem solving: Reviewing practical alternatives when packaging requirements change or unexpected issues arise.
- Supplier and quality coordination: Supporting communication, production review, and quality requirements.
- International shipping planning: Evaluating freight arrangements according to delivery priorities and budget considerations.
The goal is not simply to supply custom boxes, but to help customers make better packaging decisions throughout the project.
Conclusion: A Smarter Approach to Packaging Size Problems
This magnetic box size mismatch demonstrates why packaging projects should be evaluated as complete systems rather than collections of separate boxes.
When the smaller 10-pack boxes did not fit the completed magnetic outer boxes, replacing every component was not the only option.
By reviewing the dimensional requirements and proposing adjustments to the smaller inner boxes, Cherubox identified a more targeted corrective approach.
Additional pricing support and a flexible air-and-sea freight plan were also considered to help the customer manage the financial and logistical impact.
For brands ordering custom packaging, the key takeaway is simple:
Confirm the fit of every packaging component before mass production—and when a problem occurs, evaluate the entire packaging system before deciding what needs to be remade.
Need Help With a Custom Packaging Project?
Whether you are developing a new magnetic rigid box, coordinating multiple packaging components, or reviewing a packaging size issue, Cherubox Packaging can help you evaluate the options.
Share your box dimensions, structural drawings, packaging requirements, and order quantity. Our team can review your project and help identify practical solutions based on your design, budget, and delivery requirements.
