Void fill stops a product moving; it does not absorb serious impact. Paper, air cushions and loose fill all do that job with different trade-offs in storage, speed and recyclability. Heavy fill consumption is usually a sign the carton is the wrong size rather than a protection requirement.
What void fill is for, and what it is not for
Void fill occupies empty space so that the contents cannot move around inside the pack. That is a genuine and useful job - a product that slides about will damage itself and the carton. What fill does not do is absorb a serious impact or carry compression; those need foam, moulded pulp or structural board.
Confusing the two is how businesses end up adding more and more fill to a damage problem it was never going to solve. If product is arriving broken from a drop rather than rattling loose, more fill is the wrong answer - see protective packaging.
The options compared
| Material | Strengths | Trade-offs |
|---|---|---|
| Paper fill (kraft, honeycomb) | Recyclable kerbside, good presentation, conformable | Bulky to store, needs a dispenser for speed |
| Air cushions / pillows | Very light, compact to store as film, fast | Punctures; needs an inflation machine |
| Loose fill (chips) | Conforms to any shape, cheap per volume | Migrates to one end, messy, poor presentation |
| Bubble wrap | Light cushioning plus fill in one | Bulky to store; see Bubble Wrap and Bubble Bags: Where They Still Win |
| Corrugated inserts / pads | Rigid, single-material with the carton | Less conformable, needs specifying per product |
| Moulded pulp | Fitted, recyclable, protective | Tooling per shape; see Moulded Pulp and Fibre Packaging Explained |
Void fill materials and what each costs you.
The storage column is the one most often ignored and it matters more than people expect. Paper fill arrives as paper and takes real space; air cushion film arrives flat and is inflated on demand, which is why high-volume operations frequently choose it despite the equipment.
Matching the fill to the failure
- Product rattling loose - any fill will do; choose on storage, speed and recyclability.
- Product shifting to one end in transit - loose fill is the wrong choice, because it migrates too. Use paper or cushions that stay placed.
- Product damaged by impact - fill is not the answer. Use foam or a fitted insert - see Foam Inserts: When a Fitted Pocket Pays for Itself.
- Items abrading each other - separate them with board or interleave rather than packing fill around the group.
- Carton crushing in a stack - a board and grade problem, not a fill problem - see Single Wall or Double Wall? Choosing Corrugated Board.
Measure how much fill a typical despatch uses. If it is a lot, the first question is not which fill to buy but why the gap is there.
Presentation, recycling and the customer
Void fill is the material a customer handles most and judges a brand on. Loose fill chips are cheap and read as cheap; they also escape across the customer's floor, which nobody enjoys. Paper reads well, recycles with the carton and leaves a single-material pack.
Air cushions sit in between: light, clean and effective, but obviously plastic and requiring the customer to deal with film. Where kerbside recyclability is part of the proposition, paper is usually the answer - though the larger environmental gain is almost always right-sizing the carton so there is less to fill at all. See sustainable packaging.
What it costs to store and to apply
Void fill is compared on price per unit far more often than on the two things that actually decide its cost in an operation: how much space it occupies before use, and how long it takes to place.
| Material | Storage before use | Time to apply | Equipment |
|---|---|---|---|
| Paper fill | Bulky - arrives as paper | Fast with a dispenser, slow without | Dispenser for speed |
| Air cushions | Minimal - flat film until inflated | Fast | Inflation machine |
| Loose fill | Very bulky - mostly air already | Fast to pour, messy | Hopper for volume |
| Bubble wrap | Bulky on the roll | Moderate - cut and wrap | Dispenser |
| Corrugated pads | Compact, flat | Fast, one movement | None |
| Moulded pulp | Nests, fairly compact | Fastest - drops in | None, but tooling |
The hidden costs of each fill type.
For a high-volume operation the storage column frequently decides it. Air cushion film arrives flat and is inflated on demand, so the warehouse stores film rather than air - which is why busy benches tend towards it despite needing a machine.
For a lower-volume operation, equipment is the constraint and paper fill without a dispenser is perfectly workable. The common mistake is choosing on unit price alone and then discovering the storage or the application time does not suit the bench - see packaging for fulfilment.
The short version
- Fill stops movement; it does not absorb impact or carry compression.
- Paper, air cushions and loose fill differ most in storage, speed and recyclability.
- Loose fill migrates, so it is a poor choice where the product shifts in transit.
- Heavy fill consumption usually means the carton is oversized.
- Right-sizing the carton beats changing the fill, environmentally and commercially.
Frequently asked questions
Which void fill is best?
It depends on what you are solving for. Paper is the best all-rounder for recyclability and presentation; air cushions win on storage and speed at volume; loose fill is cheapest per volume and worst on presentation and migration.
Is void fill enough protection for fragile items?
Usually not on its own. Fill stops movement but absorbs very little impact. Genuinely fragile items need a fitted pocket or foam that holds them clear of the carton walls.
Why does our product arrive at one end of the box?
Loose fill migrates under vibration, so the product settles. Either switch to a fill that stays placed, or - better - reduce the void so there is less room for anything to move.
Which void fill is most environmentally friendly?
Paper, generally, because it goes into household recycling with the carton. But the larger gain is using less packaging overall, which means right-sizing the box rather than changing what fills it.
How much fill should a pack use?
As little as possible, because the need for it is a symptom. A pack that needs a lot of fill is telling you the carton is too big - see Cardboard Boxes: How to Specify the Right One.