Design
Custom structural packaging design and inserts
Need a box that doesn’t exist yet? We design custom shapes and engineered inserts in card, EVA or EPE foam that hold your product in place, then show you a 3D mockup and, if you want, a physical prototype before the full run.
Custom dielines · Free 3D mockup before you pay · Free US shipping

- AI-to-print studio includedAI concepts rebuilt onto exact dielines + 3D mockup
- 4–5 day rush specialistsPriority press lanes built for tight launch deadlines
- No die or plate chargesZero setup fees + 10% off your first custom order
- Free US shippingTo all 50 states · worldwide DDP shipping available
What is custom structural packaging design and inserts?
Structural packaging design is the engineering of custom box shapes and tailored card, EVA foam, or EPE foam inserts built around your exact product dimensions. Instead of letting bottles, jars, or multi-piece kits rattle in loose void fill, a custom structure locks every item in its own cavity for unboxing and shipping. At CubitPack, you see a free 3D mockup before you pay, and you can add a physical prototype or pre-run drop and crush testing.
What you get
What you get with structural design
Custom box shapes
Non-standard box structures, multi-panel openings, and presentation kits sized around your product.
Folded card inserts
Die-cut paperboard and corrugated trays or dividers that cradle bottles, jars, candles, and tubes.
EVA and EPE foam cavities
Smooth, dense EVA foam for presentation sets or shock-absorbing EPE foam for heavy and fragile items.
Multi-item kit layouts
Separate cavities arranged so multiple products sit level, stay apart in transit, and lift out cleanly.
3D mockup and fit prototype
See a free 3D mockup first, and order a physical prototype priced per product to check the fit in hand.
Pre-run drop and crush checks
Ask with your quote to drop- and crush-test the box and insert before your full production run.
How it works
Request a quote with structural design
Tell us what you’re packing and how many. Your dedicated account manager sends tailored pricing for each quantity.
Prefer to talk? or see how ordering works.
How it works
Structural design, step by step
- 01
Share your product details
Send your product’s dimensions, weight, photos, and how many items go inside one box.
- 02
We design the box and insert
We engineer the outer box structure and the card, EVA, or EPE foam cavity layout around your product.
- 03
Review in 3D or hold a prototype
Check the free digital proof and 3D mockup, and order a physical prototype if you want to test fit in hand.
- 04
Approve, pay, we produce
Production takes 10–14 business days after proof approval and payment, with free shipping to all 50 states.
What to send
What to send us
A rough start is fine: we ask for anything missing.
- Your product’s exact dimensions (length, width, height, and any cap or neck measurements) and weight
- How many items go into one box and how you want them arranged on opening
- Photos of your product, or a physical product sample if the shape is irregular
- Whether you prefer a folded card insert, smooth EVA foam, or shock-absorbing EPE foam
- How the box will be used: shipped directly in the mail, packed in master cartons, or displayed on a shelf
- How many boxes and inserts you need
Is it for you?
When to use structural design
Your product is fragile, heavy, or comes as a multi-piece set
Use structural design. We engineer an outer box and a card, EVA, or EPE foam insert so each piece stays in place.
A standard box style already fits your product
Ask for a free custom dieline at your exact inside dimensions instead of a brand-new structure.
Free custom dielinesYou want to test the physical fit in your hand before the full run
Add a physical prototype priced per product so you can put your product inside the box and insert first.
PrototypesYou want to verify shipping durability before bulk production
Ask for drop and crush testing with your quote so we check how the box and insert handle transit.
Drop and crush testingCompare
Comparing card, EVA foam, and EPE foam box inserts
| Insert material | Feel and structure | Common uses | Printed option |
|---|---|---|---|
| Cardboard and paperboard inserts | Folded die-cut card sheet with cut cavities and tabs | Cosmetics, jars, candles, and lightweight multi-item kits | Can be printed to match the box |
| EVA foam inserts | Dense, smooth closed-cell foam with clean die-cut walls | Rigid presentation boxes, glass perfume bottles, and gift sets | Unprinted foam; pairs with a printed card top layer |
| EPE foam inserts | Lightweight, resilient shock-absorbing foam | Electronics, heavy hardware, and fragile items shipped by parcel | Unprinted foam; pairs with a printed outer box |
Ready to start? Request a quote.
Send a rough idea: a product, a size and up to 3 quantities to compare.
Examples
Examples
Example designs for made-up brands, to show what you get.

A die-cut card insert for glass dropper bottles
A skincare brand locked two glass serum bottles upright inside a folded paperboard tray.

An EVA foam cavity for a candle and diffuser set
A home fragrance brand held a heavy glass tumbler candle and reed diffuser in dense charcoal EVA foam.

An EPE foam insert inside a corrugated mailer
An outdoor gear brand cushioned a stainless steel flask and cap set in shock-absorbing foam for parcel shipping.
Popular with this service
Packaging people order with it
Get a quote for any of these right here.
Products 8
Custom Box Inserts
Custom die-cut box inserts in card, corrugated, EVA foam, EPE foam and honeycomb.
Custom Cardboard Inserts
Custom die-cut cardboard inserts in folding paperboard and fluted corrugated.
Custom EVA Foam Inserts
Custom die-cut EVA foam inserts for rigid boxes, perfume, jewelry, cosmetics and electronics.
Custom EPE Foam Inserts
Custom die-cut EPE closed-cell polyethylene foam inserts for electronics, glass and tools.
Custom Mailer Boxes
From 250Custom PR Boxes
Custom printed PR boxes and media kits with fitted foam or card inserts from 250 mailers.
From 250Custom Electronics Boxes
Custom printed electronics boxes with foam or card inserts from 1,000 units.
From 1,000
Standards
Standards and rules
- 01
How drop and compression checks evaluate a box and insert
In the packaging industry, organizations such as the International Safe Transit Association (ISTA) describe how free-fall drops and compression loads test the outer container and inner cushioning together. If you want pre-run drop and crush testing on your box and insert, ask with your quote. ISTA: Transit Testing Overview
- 02
How distribution hazards affect multi-cavity packaging
Standards such as ASTM D4169 outline the shocks, stacking pressures, and vibrations packages face during parcel and freight shipping, which is why heavy or fragile sets use engineered card or foam cavities to keep items separated. ASTM D4169 Shipping Container Standard
Why CubitPack
One account manager, from first question to delivery.
- 1-on-1
Dedicated account manager
Work with one packaging specialist from sizing and dielines through proof approval and delivery.
- Free
AI & custom design studio
Bring print-ready files, a rough logo, or an AI-generated box idea — we rebuild every element onto your exact dieline for free.
- 3D
Approve before you pay
Review a high-detail 3D mockup and flat digital proof of every panel, flap and finish before paying a cent.
- 10–14
Business days to deliver
Counted from proof approval and payment, with free shipping across all 50 states. Rush orders ship in 4–5 days.
Our promises, in writing
- Reprint or refund. If we get it wrong, tell us within 14 days with photos and you choose.
- Pantone guaranteed. If a Pantone color is clearly off, we reprint it.
- Damaged in transit. We reprint the damaged units free and handle the carrier claim.
- Cancel free. Any time before you approve your proof, with a full refund.
Guides
Packaging guides for structural design
At a glance
Structural design at a glance
- What it is
- Your product needs a box shape or insert that does not exist yet.
- Cost
- Ask with your quote
- Account support
- Dedicated account manager from quote to delivery
- Before you pay
- A digital proof and a 3D mockup
- Production
- 10–14 business days after approval and payment; rush 4–5 days
FAQ
Structural design: questions
Can you design a custom insert for my product?
Yes. Send your product’s dimensions, weight, and how many pieces go inside one box. We design a folded card, EVA foam, or EPE foam insert around your items and match it to the outer box.
Can I see the box and insert before the full run?
Yes. You get a free digital proof and a 3D mockup before you pay, and you can order a physical prototype priced per product to test the exact product fit in your hand.
What is the difference between card, EVA foam, and EPE foam inserts?
Card inserts are die-cut and folded from paperboard or corrugated board and can be printed to match your box. EVA foam is dense and smooth for presentation sets and rigid boxes, while EPE foam is lighter and built to absorb shocks for fragile or heavy items in shipping.
Do I need to mail you my physical product to design an insert?
For simple bottles, jars, or rectangular items, accurate measurements and photos are usually enough to start the 3D mockup. For irregular shapes or multi-piece sets, sending a sample item or ordering a physical fit prototype lets you confirm the cavity fit before production.
How much does structural design cost?
Ask with your quote. Tell us what goes inside the box, how many pieces sit together, and your order quantity, and your account manager will confirm the details with your quote.
Can you print artwork on both the outer box and the card insert?
Yes. When you choose a paperboard or card insert, our free design help covers setting up your artwork on both the outer box dieline and the inner insert tray, with a 3D mockup before you pay.
Can you test whether the box and insert survive shipping drops?
Yes. We can drop- and crush-test your boxes before the full production run and adjust the board or the insert if needed; ask for testing with your quote. Whether you need custom packaging structural design, engineered box inserts, custom EVA and EPE foam inserts, custom cardboard box inserts, custom box shape design or fragile product insert engineering, your account manager coordinates every step.
Sources
Sources for this page
- ISTA: International Safe Transit Association: background on what packaged-product drop and compression checks evaluate
- ASTM International: ASTM D4169 Shipping Container Testing: background on parcel and freight distribution hazards that inserts protect against
Get started
Get started with structural design.
Bring a rough size, a logo, or an AI concept. One dedicated account manager guides your custom packaging from dieline and 3D proof to delivery.













