How to Choose the Right Custom Box Insert

A packaging insert does more than hold a product in place. It protects the product during transportation, organizes accessories, improves the unboxing experience and influences how customers perceive the brand.

The best packaging insert depends on five main factors:

• Product weight and fragility

• Required level of protection

• Brand positioning and appearance

• Sustainability requirements

• Order quantity and tooling budget

Paperboard, corrugated board, molded pulp, EVA foam and PET each offer different advantages. This guide explains how they compare and when each material should be used.

Packaging Insert Materials at a Glance

There is no single insert material that is best for every product. The correct solution balances protection, cost, appearance and manufacturing volume.

1. Paperboard Inserts

Paperboard inserts are made by die-cutting and folding paperboard into platforms, dividers, sleeves or product-holding structures. They can be used inside rigid boxes, folding cartons and gift boxes.

Advantages of Paperboard Inserts

• Lightweight and space-efficient

• Easy to print with brand colors or instructions

• Relatively low tooling cost

• Suitable for small and medium production runs

• Can create multiple compartments

• Helps maintain a paper-based packaging structure

• Easy to fold and assemble

Paperboard inserts are especially effective when the product is relatively light and does not require heavy impact protection.

Common Applications

• Cosmetic bottles and skincare sets

• Playing cards and collectible cards

• Chargers, cables and small electronics

• Perfume samples

• Stationery and promotional gifts

• Chocolate and confectionery products

• Small accessories

Limitations

Paperboard has limited shock absorption compared with foam or molded pulp. Thin structures can deform when supporting heavy products, so the board thickness, grain direction, locking tabs and load-bearing areas must be designed carefully.

For heavier products, laminated paperboard or folded structural supports may be required.

2. Corrugated Inserts

Corrugated inserts use fluted board to provide cushioning, separation and structural support. They are widely used for products that need more protection than standard paperboard can provide.

Depending on the product, the insert may use E-flute, B-flute, BE-flute or another corrugated structure.

Advantages of Corrugated Inserts

• Good cushioning and compression resistance

• Suitable for heavier products

• Cost-effective for shipping packaging

• Easy to prototype and modify

• Low tooling requirements

• Can be designed as dividers, end caps or suspension structures

• Compatible with corrugated shipping cartons

• Suitable for paper-based packaging programs

Corrugated inserts are often the most practical choice when transportation protection is more important than a luxury interior appearance.

Common Applications

• Consumer electronics

• Home appliances

• Hardware and tools

• Furniture components

• Glass containers

• E-commerce products

• Industrial components

• Products sold through Amazon or other online channels

Limitations

Corrugated edges and exposed flutes may not provide the refined presentation expected in some luxury packaging. However, the material can be covered, printed or combined with paperboard to create a cleaner appearance.

The insert also needs to be designed around the product’s weight, center of gravity and likely impact directions.

3. Molded Pulp Inserts

Molded pulp, also called molded fiber, is formed into a three-dimensional tray or protective structure. It can follow the shape of a product closely and is commonly used as an alternative to plastic trays or foam inserts.

Advantages of Molded Pulp

• Good product positioning

• Effective cushioning for many applications

• Natural, environmentally conscious appearance

• Suitable for complex product shapes

• Can protect corners and vulnerable components

• Stackable before final assembly

• Appropriate for medium- and high-volume programs

The surface can range from an industrial texture to a smoother premium finish, depending on the production method and design requirements.

Common Applications

• Consumer electronics

• Personal care products

• Bottles and jars

• Home appliances

• Kitchen products

• Medical and healthcare products

• Sustainable gift packaging

Limitations

Molded pulp normally requires dedicated tooling, making it less economical for very small orders. Development also takes longer than a simple die-cut paperboard insert.

The designer must consider wall thickness, draft angles, moisture exposure and dimensional tolerances. A molded pulp tray should be tested with the actual product rather than approved from drawings alone.

4. EVA Foam Inserts

EVA is a closed-cell foam that can be die-cut, CNC-cut or laminated into precise product cavities. It is commonly used when strong product retention and a premium presentation are required.

Advantages of EVA Inserts

• Strong cushioning and impact protection

• Precise product cavities

• Clean and premium appearance

• Available in different colors and densities

• Suitable for heavy or fragile products

• Resistant to light moisture exposure

• Can be laminated with velvet, paper or fabric

EVA is particularly useful when the product must remain perfectly positioned when the box is opened or transported.

Common Applications

• Jewelry and watches

• Premium electronics

• Instruments and tools

• Glass products

• Corporate gifts

• Luxury accessories

• Product demonstration kits

Limitations

EVA is generally less aligned with paper-only packaging strategies and may be difficult to recycle through normal household recycling systems. Laminating EVA with velvet, fabric or adhesive layers can make material separation more complicated.

Brands should therefore decide whether maximum protection and appearance outweigh their mono-material or recycling objectives.

5. PET Packaging Trays

PET inserts are normally thermoformed into transparent, translucent or colored trays. They provide accurate product positioning and allow customers to see the product or accessories clearly.

Advantages of PET Trays

• Precise and consistent cavities

• Clean retail presentation

• Transparent options available

• Resistant to light moisture and dust

• Suitable for automated packing

• Can hold multiple products and accessories

• Effective for higher-volume production

PET trays can be designed with finger notches, locking features and separate compartments.

Common Applications

• Cosmetic gift sets

• Electronic accessories

• Retail products

• Personal care products

• Food-contact applications using appropriate materials

• Promotional product sets

• Products requiring visible organization

Limitations

Thermoformed PET requires dedicated tooling and is usually more economical at higher volumes. Deep cavities, sharp corners and very tight tolerances can make tooling and production more complex.

Although PET can be recyclable, actual recyclability depends on tray color, labels, adhesives, additives and the recycling infrastructure available in the destination market. Sustainability claims should therefore be based on the complete packaging design rather than the resin name alone.

How to Select the Correct Packaging Insert

Consider Product Fragility

Fragile glass, electronics and precision products normally need more cushioning than garments, cards or lightweight accessories.

Do not evaluate only whether an insert holds the product. It must also control movement and protect vulnerable areas during impact.

Calculate Product Weight

A paperboard insert may work perfectly for a 100-gram cosmetic bottle but fail when used for a heavy appliance component.

Load-bearing panels, locking tabs and support points should be designed according to the actual product weight.

Define the Desired Unboxing Experience

Luxury gift packaging often prioritizes:

• Clean product alignment

• Soft-touch surfaces

• Hidden structural components

• Consistent spacing

• A strong first impression

In these situations, EVA, covered paperboard or a premium molded pulp insert may be appropriate.

For e-commerce and industrial products, corrugated inserts may provide a better balance of protection and cost.

Review Sustainability Requirements

If a brand wants a predominantly paper-based package, paperboard, corrugated board or molded pulp should normally be evaluated first.

However, sustainability should not be considered separately from product protection. An insert that looks environmentally friendly but allows the product to break during shipping can create more waste through returns, replacement products and additional transportation.

Consider Order Volume

Paperboard and corrugated inserts generally offer the easiest entry point for sampling and smaller production runs.

Molded pulp and thermoformed PET become more commercially attractive when order quantities justify the tooling investment. EVA can be suitable for both medium and large orders, depending on the cutting method and insert complexity.

Recommended Inserts by Product Type

Material compliance must be evaluated separately for food, medical or other regulated applications.

Important Insert Design Details

A successful insert should include more than a cavity matching the product dimensions. The structural designer should also consider:

• Manufacturing tolerances

• Space for labels and accessories

• Finger notches for product removal

• Product loading direction

• Sharp or delicate product areas

• Cable and manual storage

• Weight distribution

• Box-opening orientation

• Drop and vibration risks

• Assembly speed

• Material separation after use

For complex products, the packaging supplier should receive an actual product sample, a 3D file or an accurate technical drawing.

Testing the Complete Packaging System

An insert should never be evaluated by itself. The outer box, insert, product and shipping carton work as one complete packaging system.

Testing may include:

• Fit and assembly testing

• Compression testing

• Drop testing

• Vibration testing

• Transportation simulation

• Temperature and humidity evaluation

• Repeated opening and closing

For Amazon SIPP projects, packaging may need to pass a self-drop test or an ISTA 6 laboratory test, depending on the product and certification route. Amazon SIPP testing requirements

BOYA’s Custom Packaging Development Process

Zhongshan Boya Color Printing Co., Ltd. develops complete paper packaging solutions, including rigid boxes, folding cartons, corrugated packaging and custom insert integration.

A typical project includes:

1. Reviewing the product, dimensions and distribution method

2. Comparing suitable insert materials

3. Developing the box and insert structure

4. Producing a white structural sample

5. Testing product fit and removal

6. Producing a printed sample when required

7. Confirming materials, colors and finishes

8. Starting mass production

9. Inspecting the assembled packaging before shipment

With more than 20 years of printing and packaging experience, BOYA can help brands balance presentation, protection, cost and production efficiency.

Frequently Asked Questions

What is the best insert for fragile products?

There is no universal answer. EVA provides strong cushioning, while molded pulp and engineered corrugated structures can also protect fragile products effectively. The correct choice depends on product weight, shape and shipping conditions.

Which packaging insert is the most sustainable?

Paperboard, corrugated board and molded pulp are usually the strongest starting points for fiber-based packaging. Final recyclability still depends on coatings, adhesives, laminations and local recycling systems.

Is molded pulp better than EVA?

Molded pulp is more suitable for brands prioritizing a fiber-based appearance and higher-volume production. EVA may provide better precision, cushioning and luxury presentation for certain fragile products.

Can packaging inserts be printed?

Paperboard and corrugated inserts can be printed with logos, instructions and brand colors. Molded pulp can incorporate molded details, while EVA and PET branding options depend on the surface and design.

Do custom inserts increase the MOQ?

They can. Paperboard and corrugated inserts usually have lower entry requirements, while molded pulp and thermoformed PET require dedicated tooling and are better suited to larger production volumes.

What information is needed for a quotation?

Provide the product dimensions, weight, photographs, order quantity, box style, preferred insert material, destination market and testing requirements. An actual product sample is recommended for complex or fragile items.

Request a Custom Packaging Insert

Not sure whether your product needs paperboard, corrugated, molded pulp, EVA or PET?

Send BOYA your product dimensions, weight, quantity and packaging requirements. Our team can recommend a suitable box-and-insert structure and prepare a custom quotation.

Contact BOYA Packaging for a custom packaging insert consultation.