Blog · By The Packaging Vista Team · October 28, 2026
Custom Inserts 101: Types, Uses, and When to Invest
Reviewed by Kate Johnson — Custom Packaging Specialist
12+ years in folding carton, corrugated, and rigid-box production at US contract packaging houses. Specializes in custom insert engineering build decisions — dieline engineering, offset vs digital print tradeoffs, finish stacks, and SMB-scale sourcing.
Reviews every structural and material spec on this page against primary sources (FEFCO, ASTM, FDA) and against 500+ brand builds overseen on the plant floor.
Credentials: FEFCO code-literate structural reviewer, FSC Chain-of-Custody auditor, G7 GRACoL color-management training. Last reviewed: November 2026.
A packaging insert is what separates a box that looks premium from one that just protects. It is also what stops a glass bottle from rattling, keeps a multi-piece kit organized, and gives the customer a moment of "they thought about this" when they first open the box. Here are the five insert types brands actually order, when each one earns its spot, and what the cost difference looks like.
What is a packaging insert?
An insert is a secondary piece inside the primary box that holds, cradles, or organizes the product. It is cut from paperboard, foam, pulp, corrugated, or a bespoke material and sized to the exact product dimensions. Inserts are what make unboxing feel designed instead of accidental.
The five insert types
1. Paperboard insert (die-cut)
A flat paperboard sheet cut to cradle the product — the simplest and cheapest option. Great for cosmetics boxes holding a single bottle, soap bars that need a divider, or cosmetic kits with a shallow 2–3 piece layout.
- Best for: single product retail cartons, soap, lip products, sampler kits
- Cost impact: +$0.08–$0.25 per unit at 100
2. EVA foam insert
Closed-cell foam cut to the product shape — the standard for luxury, electronics, and anything fragile. The dense foam cradles the product and absorbs impact in transit. Reads as high-end on open.
- Best for: jewelry, watches, electronics, premium cosmetics, fragrance
- Cost impact: +$0.40–$1.50 per unit at 100 depending on thickness and die complexity
3. Molded pulp insert
Pressed from recycled paper pulp into the product shape — the sustainable alternative to EVA foam. Compostable, recyclable, and increasingly used in beauty, DTC, and electronics.
- Best for: sustainability-forward brands, electronics, beauty
- Cost impact: +$0.35–$1.20 per unit at 100; tooling cost for the mold is amortized across the run
4. Corrugated insert
Die-cut corrugated board that creates slots, dividers, or honeycomb-style cells inside the box. Best for shipping cartons and heavier product where corrugated handles the weight.
- Best for: wine and beverage shipping, multi-pack electronics, hardware kits
- Cost impact: +$0.25–$0.80 per unit at 100
5. Custom die-cut cardboard tray
Hybrid between paperboard insert and corrugated — a thin cardboard tray with die-cut cavities for a multi-piece kit. Common inside sleeve-and-tray constructions.
- Best for: starter kits, 3-step routines, holiday bundles, PR mailers
- Cost impact: +$0.30–$0.90 per unit at 100
When to invest in an insert
Three triggers justify adding an insert:
- Fragile product. Glass, ceramic, electronics, anything that cracks. The insert is cheaper than the damage return.
- Multi-piece kit. If the box holds 2+ SKUs, an insert organizes them so the arrangement survives shipping and reads as curated on open.
- Retail price positioning. Above $40–$50 retail, inserts start paying for themselves in perceived value and unboxing content.
How we quote inserts
At Packaging Vista we build inserts alongside the box on the same quote. The design team sizes the insert to your product dimensions, we recommend the material based on product fragility and brand positioning, and the insert runs on the same production timeline as the box. See our custom boxes and rigid boxes for insert-ready constructions.
Insert materials compared — paperboard, EVA foam, molded pulp, corrugated fitments
The four workhorse insert materials each win on a different axis, and the honest trade-offs are easier to see side by side. Paperboard is the cheapest and the most recyclable —
it drops into curbside bins with the carton and prints full-color CMYK, but it offers almost no cushioning on fragile glass. EVA foam is the opposite: dense closed-cell foam cradles a perfume flacon or watch case with real shock absorption and reads as luxury the moment the lid lifts, but it is not curbside-recyclable in most US municipalities and adds $0.25–$0.80 per box depending on cavity complexity.
Molded pulp splits the difference — recyclable and compostable, protective enough for electronics and beauty, and increasingly specified by sustainability-forward brands —
but the custom mold adds 5–7 days of tooling lead time on the first run. Corrugated fitments are the right call for heavier SKUs (wine bottles, hardware kits, three-piece glass sets) because the fluted board carries real weight for pennies at scale.
For a quick mental model: paperboard protects the brand, EVA protects the product, pulp protects both the product and the shelf story, and corrugated protects the shipment. See how each plays inside a rigid box, mailer box, or eco-friendly box.
ROI math: when inserts save more than they cost
Inserts look like a line-item cost until you back out the breakage and returns they prevent. A typical glass fragrance or candle SKU shipped loose in a snug carton still breaks on 6–10% of transit runs once drop and vibration are included;
a properly cavity-cut EVA or molded-pulp insert drops that rate below 1% in our customer data. On a $35 candle with a $9 replacement cost and $6 return-shipping exposure, every prevented breakage saves roughly $15.
A paperboard insert at $0.05–$0.25 per box pays for itself the first time it stops one breakage per 100 units; an EVA insert at $0.25–$0.80 clears its cost on glass SKUs by the second or third prevented loss.
The upside past breakage is quieter but compounds — higher average review scores (fewer "arrived cracked" one-stars), fewer support tickets, and better unboxing content for TikTok and Reels because a cradled product photographs like a gift instead of a parcel.
For cosmetic, candle, and jewelry brands above the $40 retail line, the insert is almost always the cheapest line item on the unit cost sheet relative to the problems it removes.
Frequently asked questions
Do I need an insert for a single-product box?
Not always. A snug-fit box (jar + 1/8" clearance) stops rattling on its own. Add a paperboard insert if the product is tall and could tip, or if you want the extra visual polish on open.
What is the cheapest insert?
A flat die-cut paperboard divider — around $0.08–$0.25 per unit at 100-box quantities. Great for soap bars, cosmetics, and small retail SKUs.
Can inserts be printed?
Yes. Paperboard and cardboard inserts print full-color CMYK on either side. EVA foam and molded pulp are typically unprinted but can carry a logo deboss.
How long does an insert add to lead time?
None if we build it alongside your box — both ship on the same 8–10 business day production timeline. Molded pulp inserts needing a new mold can add 5–7 days for tooling the first time only.
How thick should my insert be?
For paperboard dividers, 18–24 pt board (roughly 0.018"–0.024") holds a single bar or bottle without flex. For EVA foam cradling glass, 10–15 mm of thickness is the sweet spot —
thick enough to compress on impact, thin enough to still leave room for the product inside a standard rigid box. Molded pulp usually lands at 3–5 mm wall thickness, which is already engineered into the tooling.
If in doubt, send the heaviest SKU in the kit and we will spec the thickness against drop-test targets.
Are molded pulp inserts recyclable?
Yes — molded pulp is made from recycled paper fiber and is accepted in standard US curbside paper recycling streams in most municipalities. It is also home-compostable when the pulp is uncoated, which is the default spec we quote.
If you need a moisture or oil barrier, ask for a water-based coating rather than a PE film; the water-based coat keeps the insert in the recyclable stream and dodges California AB 1200 PFAS concerns.
See more eco-friendly box options that pair well with pulp inserts.
Can I get inserts for a line with multiple SKU sizes?
Yes, and it is one of the most common builds we quote. Three paths work:
- one master insert cavity sized to the largest SKU with a paperboard shim for smaller SKUs
- separate die-cut paperboard inserts per SKU on the same carton, or
- a single molded-pulp or EVA mold with multiple cavity depths for a kit-style box. Path 1 is the cheapest, path 3 is the most premium. For a 3–5 SKU skincare or candle line, we often quote all three paths on the same request so you can pick the right cost-vs-polish trade-off. Send the SKU dimensions with your quote request and we will cost each path
Thinking about adding inserts to your box? Our team builds free dielines on custom boxes with insert sizing at 100-box minimums — request a free quote with your product dimensions and we will spec the right insert type.
