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How to Choose Void Fill & Cushioning
Empty space inside a shipping box is a problem, but filling that space is not the same as protecting a fragile product from impact. That distinction is where a lot of packaging decisions go wrong.
Start with what can damage the product: movement, impact, abrasion, puncture, compression, static, corrosion or a combination of several. Then choose the protective materials that address those specific risks.
Protective Packaging Guide
Build the Right Protective Pack
Void Fill and Cushioning Are Not the Same Thing
They may work together, and some materials can perform both functions, but the jobs are different.
| Function | Main Job | What It Does Not Automatically Solve |
|---|---|---|
| Void Fill | Occupies open carton space and helps limit product movement | Shock, drop or impact protection for a fragile item |
| Cushioning | Helps manage impact, contact and handling forces around the product | Large uncontrolled voids or poor product positioning |
| Surface Protection | Helps reduce rubbing, scratches and abrasion | Major impact or crush protection |
| Blocking & Bracing | Holds the product in a controlled position | Cushioning unless the structure is designed to provide it |
The practical takeaway: If the product is moving, you have a containment or positioning problem. If the product is breaking when the carton is dropped or hit, you have a cushioning problem. Those can happen in the same shipment, but they should not be treated as the same failure.
Start With the Damage Risk
1
Product movement
If the product can slide, bounce or migrate inside the carton, reduce the open space or add a method that holds the product in position. Paper, air pillows, loose fill, inserts and other blocking methods can all be useful depending on product geometry and weight.
2
Shock and impact
Fragile products may need material between the product and the carton that can manage handling forces. Air-cell cushioning, foam, paper cushioning systems and engineered protective structures behave differently under load, so select them around the product rather than simply adding more material.
3
Abrasion and surface damage
A product can arrive structurally intact and still be unacceptable because the finish is scratched or marked. Foam sheets, paper, bags, sleeves and interleaving materials can separate surfaces without being the primary impact cushion.
4
Puncture and concentrated edges
Sharp corners, metal parts and small contact points can cut through soft protective materials. A thicker wrap is not always the answer. Edge protection, caps, corrugated structures, orientation changes or a more rigid blocking system may be needed.
5
Compression
If the outer carton is collapsing or the product is being damaged by stacking pressure, adding loose material inside the box may not solve the problem. Review carton strength, product support, load distribution and stacking conditions.
6
Static or corrosion
These require specialized protection. Anti-static cushioning can help reduce static generation, but it is not automatically a static-shielding package. VCI products can help protect compatible metals from corrosion when used correctly, but they should be selected for the specific metal, environment and storage application.
7
More than one failure mode
This is common. A glass component might need surface separation, impact cushioning and movement control. A metal part may need corrosion protection plus a structured cushion. Build the pack as a system rather than expecting one material to perform every job.
Already troubleshooting recurring shipping damage? If you are seeing breakage, product movement, crushed cartons, punctures, scratches or more than one failure at the same time, use the Packaging Damage Troubleshooting Guide to work backward from the symptom before changing the protective material.
Compare Void Fill & Cushioning Materials
Use this as a starting point, not a substitute for testing the finished package.
| Material | Useful For | Watch For |
|---|---|---|
| Kraft Paper | Void fill, wrapping, layering, separation and selected blocking applications | Paper weight, amount used, packing consistency and product sensitivity |
| Air Pillows | Lightweight void fill and movement control in compatible shipments | Sharp products, heavy loads, puncture and using pillows as the only protection for fragile products |
| Air-Bubble Cushioning | Wrapping, cushioning, separation and light void control | Cell size, number of layers, compression, sharp edges and product weight |
| Foam | Surface protection, separation, cushioning, corners and engineered protection | Foam type, density, thickness, compression behavior and exact protective function |
| Loose Fill | Filling irregular voids and surrounding compatible shapes | Settling, product migration, cleanup and heavy products moving through the material |
| Cushion Pads | Repeatable cushioning, layering or separation where the specific pad fits the application | Pad construction, product weight, orientation and required coverage |
| VCI Paper | Corrosion protection for compatible metal applications | Metal compatibility, environment, storage conditions and supplier instructions |
| Vermiculite | Selected absorbent and void-fill applications | Product compatibility, dust, cleanup and any shipment-specific requirements |
Kraft Paper
Kraft paper is one of the most flexible packing materials because the same material can be used differently depending on the job. Flat sheets can wrap or separate products, while crumpled paper can occupy open carton space and help brace compatible items.
Paper performance depends on basis weight, sheet or roll size, how tightly it is formed and how consistently packers use it. A small amount of loose paper placed on top of a product is very different from a properly built paper pack around the product.
Shop Kraft Paper →Air Pillows & Inflatable Void Fill
Air pillows are primarily useful for occupying open carton space without storing large volumes of pre-expanded material. Film is inflated at or near the packing station, which can make the format attractive for higher-volume operations.
They are not a universal cushioning solution. Heavy products can compress or move past lightweight pillows, while sharp edges can puncture the film. Use them where the main job is controlling open space and movement, and add other protection when the product requires it.
Explore Air Cushion Packaging →Air-Bubble Cushioning
Air-bubble cushioning uses sealed air cells to create a flexible protective layer around or between products. It can provide cushioning, surface separation and some movement control depending on how it is used.
Cell size, film construction, number of layers and product weight all matter. A single layer around a lightweight item and several layers around a fragile component are not equivalent protective systems.
Shop Air-Bubble Cushioning →Foam Packaging
Foam is a broad material family, not one type of protection. Rolls and sheets can wrap or separate surfaces. Pouches can speed repeat packing. Corners can protect selected edges. Convoluted or fabricated structures can provide a very different level of support than thin sheet foam.
Choose the foam around its actual job and the product load. Thickness alone does not tell you how a foam will compress, recover or protect a product.
Shop Foam Products →Loose Fill
Loose-fill material can flow around irregular shapes and occupy spaces that are awkward for sheets or fixed pads. That can make it useful in mixed-product packing environments.
The important limitation is settling. A heavy product can migrate through loose material during handling, leaving less protection where it is needed. Build enough support around and beneath the product, and use a more structured cushioning or blocking method when the load demands it.
Shop Loose Fill →Cushion Pads
Pre-sized cushioning pads can simplify repeat packing where a consistent pad size and placement work for the product. They may be useful for layering, separation or cushioning depending on the specific pad construction.
A ready-to-use pad can improve packing consistency, but it still has to match the product geometry, weight and expected handling.
Shop Cushion Pads →Specialty Protection Needs a Specialty Material
Static-sensitive electronics
Anti-static foam or air-cell cushioning can help reduce static generation, but that does not automatically provide electrostatic-discharge shielding. Sensitive electronics may require a separate shielding package and a controlled ESD process.
Corrosion-sensitive metal parts
VCI paper can add corrosion protection around compatible metal products while also serving as a wrap or separator. Select it based on the metal, environment, storage period and supplier instructions rather than treating all VCI products as interchangeable.
Shop VCI Paper →Absorbent or application-specific fill
Vermiculite may be used in selected applications where loose fill and absorbency are useful. If the shipment involves regulated materials, choose the complete packaging system based on the applicable requirements rather than assuming the fill material alone establishes compliance.
Shop Vermiculite →Start With a Carton That Gives the Protection Room to Work
Protective packaging cannot fix every carton-sizing problem.
A carton that is much too large creates unnecessary space to control and can increase material use. A carton that is too tight may leave no room for the cushioning system to function as intended.
There is no universal cushioning clearance. The space required around a product depends on the product, cushioning material, package design and expected handling. Avoid one-size-fits-all rules such as always leaving a fixed number of inches around every fragile item.
If the carton itself needs to be reconsidered, use the Shipping Box Sizes Guide.
Multiple Products Need Product-to-Product Protection Too
Keeping items away from the outer carton wall is only part of the job. Multiple products can damage one another when they are allowed to collide, rub or concentrate weight against a vulnerable surface.
Depending on the shipment, use:
• Individual wrapping
• Interleaving sheets
• Dividers or partitions
• Foam or corrugated inserts
• Corner or edge protection
• Separate compartments or trays
The goal is controlled separation, not simply filling every empty area with loose material.
The Best Material Still Has to Work at the Packing Station
A protective material that works in a sample pack but slows every production order may not be the right operational choice. Evaluate protection and packing workflow together.
| Operational Question | Why It Matters |
|---|---|
| How much storage space does the material require? | Pre-expanded materials and on-demand systems use warehouse space very differently. |
| Does the operator measure, cut or form it? | Extra handling can add labor and create inconsistency between packers. |
| Can the process be repeated consistently? | A protective pack is only useful if different operators can reproduce it. |
| Does it require equipment? | Inflatable systems, paper systems and other equipment can change material storage, throughput and maintenance needs. |
| How often does the product mix change? | A flexible material system may work better in mixed-SKU operations, while repeat products may justify pre-cut or engineered protection. |
Compare Total Cost Per Packed Shipment
Cost per roll, sheet or cubic foot is only one part of the decision.
• Protective material used per shipment
• Packing labor
• Equipment and maintenance
• Warehouse storage
• Finished package size and weight
• Damage and replacement exposure
• Cleanup and material handling
• Number of different materials the pack requires
A lower-cost material can become expensive if packers use too much of it or if it creates a second packing step. A higher-cost material can make sense when it improves consistency, reduces material use or eliminates another component.
Sustainability Starts With Using the Right Amount of the Right Material
Do not reduce this decision to paper versus plastic. A packaging system should first protect the product with an appropriate amount of material.
When comparing options, look at:
• Total material used
• Recycled content where documented
• Package size and weight
• Damage prevention
• Whether materials can be separated after use
• Whether appropriate recycling or recovery options actually exist where the package is discarded
Avoid broad claims based only on the material name. Recyclability, compostability and recycled content are separate characteristics and depend on the specific product and available recovery system.
Test the Complete Package, Not the Material by Itself
Protective performance depends on the full pack-out: product, outer carton, cushioning, void space, placement, closure and handling environment.
For important or repeat shipments, evaluate the finished package under conditions representative of how it will actually be handled. Formal testing may be appropriate when product value, damage exposure or customer requirements justify it.
A material that worked in another shipment is not proof that the same material, thickness or quantity will work for a different product.
Common Void Fill & Cushioning Mistakes
Using void fill as the only protection for a fragile item
Filling empty space can reduce movement without providing enough impact protection.
Starting with the material instead of the failure
“We always use paper” is not a packaging specification.
Using an oversized carton and compensating with more fill
Review the carton size before adding unnecessary material.
Protecting the outer walls but not separating multiple products
Product-to-product contact can be just as damaging as contact with the carton.
Ignoring sharp edges
Concentrated edges can puncture soft cushioning or inflatable film.
Assuming more material means more protection
Incorrectly placed or over-compressed cushioning may add cost without improving the package.
Skipping repeatability
If one experienced packer can make the package work but the rest of the team cannot reproduce it, the process needs more standardization.
Related Protective Packaging Guides
Go deeper into protective packaging, fragile-product protection, shipping damage and carton sizing.
Void Fill & Cushioning FAQs
What is the difference between void fill and cushioning?
Void fill mainly occupies open carton space to help reduce product movement. Cushioning is selected to help manage impact, contact and handling forces around the product. Some materials can perform both functions, but the two jobs are not interchangeable.
What is the best void-fill material?
There is no single best material. Product weight, geometry, fragility, carton size, packing speed, storage space and handling conditions determine which option makes sense.
Are air pillows cushioning?
Air pillows are primarily used as lightweight void fill and movement control. They may provide some separation, but they should not automatically be treated as sufficient impact cushioning for fragile or heavy products.
How much cushioning should I use?
There is no universal amount. Use enough material and clearance to protect the product under the expected handling conditions without over-compressing the cushioning or creating unnecessary package size. Test the finished package rather than relying on one fixed rule.
When should I use foam instead of paper?
Foam may make sense when the product needs nonabrasive separation, defined cushioning, corner protection or a more repeatable protective structure. Paper can work well for wrapping, void fill, layering and selected blocking applications. The product and required function should drive the choice.
Can I use one cushioning material for every shipment?
Usually not if your product mix varies significantly. Weight, fragility, shape, surface finish, static sensitivity, corrosion risk and carton geometry can require different protective strategies.
Does more cushioning always mean better protection?
No. Poorly placed, over-compressed or unnecessary material can add cost without solving the actual failure. The objective is a controlled protective system, not simply more material.
How do I know if my protective package is good enough?
Evaluate the complete packed shipment under conditions that reflect expected handling. For repeat, high-value or higher-risk shipments, formal package testing may be appropriate.
Keep Building the Packaging System
Protective material is only one part of the shipment. Use these resources when you also need to evaluate carton size, material selection or the broader packing operation.
Still trying to solve a packaging damage problem? Tell us what you are packing, how it is being damaged and how the shipment moves through your operation. Packaging HERO can help you narrow the protection options before you simply add more material.
