Custom corrugated boxes are printed shipping boxes built from fluted board, specified by flute profile and board strength rather than by dimensions alone. We produce single, double and triple wall construction in RSC, full overlap, die-cut and telescoping styles, printed by flexo, litho-lamination or digital. Orders start at 200 units with a free dieline.

The specification that matters most isn’t the one most suppliers ask about. Two boxes with identical dimensions and the same flute can fail very differently in a freight network, because strength comes from the board grade, not the flute name. We quote against what you’re actually shipping and how it’s stacked.

Flute Profiles and What Each One Does

The flute is the wave of paper between the two liners. Profile height controls cushioning, stacking strength and how well the box prints.

Board Strength: ECT and Mullen, and Why It’s on the Box

Every corrugated box carries a round stamp on one of its base flaps, the box maker’s certificate. It states the board’s strength rating, and it’s the single most useful piece of information on a box you’re comparing against a competitor’s.

Two rating systems, and they measure different things:

• ECT (Edge Crush Test) measures the board’s resistance to crushing on its edge, which is what predicts stacking strength. If your boxes go on pallets or into a warehouse rack, this is the number that matters. 32 ECT is the common single-wall benchmark; heavier applications run to 44, 48 and beyond, with double wall commonly specified from 48 to 71 ECT.
• Mullen or bursting test measures resistance to puncture and rupture, expressed in pounds per square inch. It predicts how the box handles impact and rough handling rather than stacking. 200# is the traditional single-wall equivalent of 32 ECT.

The practical point: flute profile alone tells you almost nothing about strength. Two B-flute boxes at different board grades perform very differently. Specify the flute and the rating.

Give us the product weight, the case weight, how high you stack, and whether the boxes sit in a warehouse for weeks or ship straight out. We’ll specify the board against that rather than defaulting to one grade for every job.

Two Things That Quietly Destroy Stacking Strength

Worth knowing before you blame the box.

1. Humidity. Corrugated is paper, and paper absorbs ambient moisture. Compression strength falls significantly as board moisture content rises, so a box that holds a four-high stack in a dry warehouse can start to slump in a humid one, or in a container crossing the tropics. If your storage or transit involves high humidity, tell us and we’ll specify board with that headroom built in rather than to the dry-condition figure.

2. Stacking pattern. Column stacking, where box corners sit directly on the corners below, is substantially stronger than interlocked or cross-stacked patterns, because corrugated carries load through its vertical corners. Interlocking a pallet for stability sacrifices a meaningful share of your stacking strength. If your warehouse or your customer’s warehouse interlocks by policy, that has to be in the board specification from the start.

Box Styles

• RSC (regular slotted container): the standard shipping box. All flaps the same length, outer flaps meet in the middle. Most economical to produce.
• FOL (full overlap): outer flaps overlap fully, giving extra strength and edge protection on heavy or fragile loads.
• HSC (half slotted container): open top, often used as a base with a separate lid or a telescoping cover.
• Telescoping (two-piece): separate base and lid, for large or heavy items and export.
• Die-cut and one-piece folder: flat-blank construction folding into shape, common for books, apparel and mailers.
• Roll end tuck top: the mailer box style, tape-free and retail-facing.
• Bliss box: three-piece construction for high compression strength, used in produce and heavy grocery.
• Display and shelf-ready formats: shippers that convert into a display via tear-away perforation.

Printing on Corrugated

• Direct flexo: printed straight onto the board. Most economical, handles bold flat colour, logos and type well. Fine detail and photographic images suffer.
• Litho-lamination: artwork offset-printed on coated paper then laminated to the board. Photographic quality on a structural base, at a higher setup cost. The right call for retail-facing corrugated.
• Digital: no plates and no plate cost, which makes it the economical route for short runs and multiple artwork variants.
• Liner choice matters more than people think. Upgrading to a white-top or clay-coated liner on the same flute usually improves colour fidelity more than changing flute profile, and often costs less than you’d expect.

If you’re printing a logo and a colour block, flexo will serve you well and save real money. If you’re printing product photography for a retail shelf, litho-lamination is worth the premium. We’ll quote both so the gap is visible rather than assumed.

Box Size and Your Freight Bill

Corrugated dimensions carry a cost beyond the box itself, because carriers bill on the greater of actual or dimensional weight. Since July 2026, UPS, FedEx and USPS all use a divisor of 139, and every fractional dimension rounds up to the next whole inch before the calculation runs. USPS applies dimensional weight only above one cubic foot; UPS and FedEx apply it to every parcel.

For a parcel-shipped box, an inch of unnecessary size is a cost you pay on every order for the life of the SKU. Full detail and a size-by-size table sit on our mailer boxes page. Carrier rules change with annual rate updates, so confirm current figures against your own carrier agreement.

For palletised freight the equivalent question is cube efficiency: how your case dimensions divide into a standard 48” × 40” pallet footprint. A case that leaves two inches of dead space per row costs you a slot on every pallet you ship. Send us your pallet pattern and we’ll check the case size against it.

What Our Customers Say

“Really impressed with the quality of my packaging. The Grand Packaging delivered results that truly exceeded my expectations. Working with Daniel was super smooth. The design support was amazing, customer service was excellent, and overall the experience was very positive.” Debbie Muller, Designer

“Working with Daniel on our first custom packaging order was a great experience. He made everything easy to understand and guided us through each step. Communication was quick, pricing was fair, and the quality of our boxes exceeded our expectations. Highly recommend!” Casey, CTO

Who We Produce Corrugated Packaging For

• Ecommerce and DTC brands shipping direct or through a 3PL
• Food and beverage producers needing case-ready cartons and grease-resistant options
• Manufacturers and industrial suppliers shipping heavy or awkward components
• Distributors and wholesalers supplying retail accounts in case quantities
• Subscription brands using corrugated as both shipper and unboxing surface
• Retail suppliers needing shelf-ready cases that ship and merchandise in one unit

Materials and Finishing

• Natural kraft liner: uncoated, recycled content, lowest cost, the industrial standard
• White-top liner: for better print contrast without moving to a coated stock
• Clay-coated liner: best colour fidelity on directly printed board
• Grease-resistant board: for food applications where oil migration would show through
• Moisture-resistant coatings: for cold chain, produce and high-humidity transit
• Fitted inserts and partitions: holding product away from the walls, which is usually cheaper than upgrading the whole board
• Labels and stickers: case marking, batch coding and branding on plain kraft
• Perforated tear-away: for shelf-ready and easy-open formats

Pricing and Minimum Order Quantity

The minimum order for custom corrugated boxes is 200 units. Very large formats, triple wall and litho-laminated runs are quoted case by case.

Corrugated pricing is driven by board grade, size, print method and construction. Board grade is where most money is won or lost. Over-specifying wastes money on every box; under-specifying costs more in damage claims than the board ever saved. That’s why we ask about weight, stacking and storage conditions before quoting rather than after.

First-time customers currently receive 20% off their first order.

How Your Order Is Produced

1. Send your requirements. Product and case weight, dimensions, stack height, storage and transit conditions, quantity, and how the box ships.
2. Receive your quote and dieline. Board grade specified against your load, with flute and rating stated rather than implied.
3. Place artwork and approve the proof. Our team checks bleed, colour mode, resolution, fold and score lines, and print method suitability for your artwork.
4. Request a physical sample (optional). Order within 30 days and the cost is credited back. Pack it, seal it and stack it, because compression behaviour is only visible in a real box.
5. Production. Printing, lamination where specified, die-cutting, gluing and bundling.
6. Quality check and dispatch. Shipped flat, ready to assemble.

Standard production runs 8 to 12 days after proof approval, plus transit. Double and triple wall construction, litho-lamination and large-format work take longer, so confirm the timeline with your consultant.

Frequently Asked Questions

What is the minimum order for custom corrugated boxes?

The minimum is 200 units. Very large formats, triple wall construction and litho-laminated runs are quoted individually because board and tooling costs scale differently at those specifications.

How long does production take?

Standard production is 8 to 12 days after proof approval, plus transit. Double and triple wall construction, litho-lamination and large-format work sit at the longer end.

What is the difference between cardboard and corrugated?

Cardboard, properly called paperboard, is a single solid layer of pressed paper used for retail cartons. Corrugated has two liners with a fluted wave glued between them, which is what gives it strength and cushioning for shipping. If the box will be seen on a shelf, look at cardboard boxes. If the box is the shipment, corrugated is what you need.

What does 32 ECT mean?

ECT is the Edge Crush Test, measuring the board’s resistance to crushing on its edge, which predicts stacking strength. 32 ECT is the common single-wall benchmark, suitable for most parcel shipping. Heavier applications run to 44 or 48 ECT, and double wall board is commonly specified from 48 to 71 ECT. It appears on the box maker’s certificate stamped on the base of the box.

Should I specify ECT or Mullen?

Specify ECT if stacking strength is your concern, which it is for anything palletised or warehoused. Specify Mullen, the bursting test, if puncture and impact resistance matter more, which is typical for rough handling and heavy irregular contents. 200# Mullen is the traditional equivalent of 32 ECT.

How much weight can a corrugated box hold?

It depends on board grade, box dimensions, stack height, how long it’s stacked and the humidity it sits in, not on the flute name alone. Compression strength also falls as board absorbs ambient moisture, so a box rated for a stack in dry storage can slump in humid conditions. Give us the load and conditions and we’ll specify with headroom.

Does stacking pattern affect strength?

Yes, significantly. Column stacking, with corners aligned directly above corners, is substantially stronger than interlocked stacking, because corrugated carries load through its vertical corners. If your warehouse interlocks pallets for stability, the board needs specifying for that from the start.

Can corrugated boxes be printed in full colour?

Yes, by three routes. Direct flexo is most economical and suits logos and flat colour. Litho-lamination gives photographic quality at a higher setup cost. Digital avoids plate costs and suits short runs. Upgrading the liner to white-top or clay-coated often improves colour more than changing print method.

Are corrugated boxes recyclable?

Corrugated is among the most widely recovered packaging materials in the US. Plastic tape, labels and wax coatings reduce recyclability, so if that matters, ask us about uncoated board and paper-based tape alternatives.

Why Brands Order Corrugated From Us

• Board specified, not assumed. You get a flute and a strength rating chosen against your load, stack height and storage conditions.
• We ask about humidity and stacking pattern. Two of the biggest causes of field failure, and two questions most suppliers never ask.
• Print method costed both ways. Flexo quoted against litho-lamination so you can see whether the premium is worth it for your artwork.
• Freight considered. Dimensions checked against dimensional weight for parcel, and against pallet footprint for freight.
• Sample credited back. Pack it, stack it and test it before committing.
• One named contact. The same consultant across every SKU and reorder.
• US-based support. Quotes, proofs and phone support in US hours from our St. Petersburg, Florida office.

Request a Quote for Custom Corrugated Boxes

Tell us the weight, how high it stacks, where it’s stored and how it ships. That’s what we need to specify board properly and quote you accurately the first time.

Call: +1 (630) 228-1764 Email: sales@thegrandpackaging.com Hours: Monday to Friday, 9:00 am to 5:00 pm ET

Dimensional weight figures reflect published carrier rules as of September 2026. Last updated: September 2026.