Guide · 6 min read
Custom box inserts explained: board, foam, pulp and fabric
An insert turns a box into packaging. What each insert material does, which products need which, and how inserts are designed with the box.
A box that fits the product loosely needs something to fill the gap, and crumpled paper is not a brand experience. A custom insert is cut to the product's footprint so it sits in one place, cannot move in transit and is presented the moment the lid lifts. It also does structural work. This guide covers the four insert materials and how to choose.
Die-cut paperboard
Folded and slotted board — usually the same SBS or kraft as a carton — forming platforms, cavities and dividers. Light, printable, recyclable with the box, and the right answer for most retail products: cosmetics sets, candles, small goods. A board platform can lift a product to the lid line so it presents on opening.
Corrugated cradles
E-flute dividers, cells and cradles for heavier items and multi-packs. The same material as a mailer, so the whole pack recycles together. Good for glassware, food multi-packs and kits.
Cut foam
EVA, PE or PU foam with the product's silhouette cut out. The most protective option and the one for electronics, instruments, glass and anything that must survive a drop. Available in black, white or gray. Not recyclable with the box, so specify it only where the protection is needed.
Moulded pulp
Fibre trays moulded to the product's shape. Protective, sustainable, and with a natural look that suits craft, food and eco positioning. Good where a foam-like cradle is wanted without foam.
Fabric-wrapped platforms
A board or foam platform covered in satin, velvet or linen. The jewelry and luxury standard: ring slots, earring holes, necklace hooks and watch pillows, all cut to the piece and wrapped in a color that suits the brand.
Which insert for which product
| Product | Insert | Why |
|---|---|---|
| Cosmetics set | Die-cut board | Light, printable, holds bottles central |
| Candle in glass | Board cradle or pulp | Keeps glass off the board |
| Electronics | Cut foam or board tray | Absorbs drop, separates accessories |
| Jewelry | Fabric-wrapped platform | Presentation and precise slots |
| Food multi-pack | Corrugated cells | Keeps items apart, recycles together |
| Subscription kit | Board platform | Presents several items at once |
Designing the insert with the box
Inserts are specified alongside the box, never after it. We draw the cavity first — from the product's dimensions, weight and count — then size the box around it, so the two fit as one pack. Adding an insert to an existing box usually means compromising one or the other.
Questions
Related questions.
Anything not covered here, put it in the notes on your quote and we will answer it directly.
Ask on your quoteAre inserts recyclable?
Board, corrugated and pulp inserts recycle with the box. Foam does not, which is why we recommend it only where the protection is needed.
Can an insert be printed?
Yes. Board inserts print like the box — a color field, a pattern or a message under the product.
Do I need an insert for a single product?
If the product can move inside the box, yes. A well-sized carton with a snug fit may not need one; a rigid box almost always does.
Packaging covered in this guide
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Or talk to a packaging specialist: (209) 444-0744