Heavy Duty Shipping Boxes
Product Description
Double and triple-wall corrugated boxes with reinforced corners and a top edge-crush grade for dense, bulky, and high-value freight under heavy pallet stacking.
Key Features
Double and triple wall
Reinforced corner design
Top edge-crush grade
Fitted load inserts
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Product Specification
| Box Style | Mailer / Shipping Box |
| Dimension (L + W + H) | All Custom Sizes & Shapes |
| Quantities | No Minimum Order Required |
| Stock | 18pt to 32pt Corrugated, Kraft, White SBS |
| Printing | No Printing, CMYK, CMYK + 1 PMS, CMYK + 2 PMS |
| Finishing | Gloss Lamination, Matte Lamination, Gloss AQ, Spot UV, Embossing, Foiling |
| Included Options | Die Cutting, Gluing, Scored, Perforation |
| Additional Options | Eco-Friendly, Recycled Boxes, Biodegradable |
| Proof | Flat View, 3D Mock-up, Physical Sampling (On request) |
| Turnaround | 8 – 10 Business Days, RUSH |
| Shipping | FREE (Continental US) |
Need custom dimensions or special finishes? We manufacture to your exact specs.
Get a Free QuoteHeavy Duty Shipping Boxes | Reinforced Wall Construction
Heavy duty shipping boxes carry dense, bulky, and high-value goods in double and triple-wall board with reinforced corners at the stress points a stacked pallet drives down. A top edge-crush grade rates the column the carton survives, wall count and board thickness step up with the load, and the exterior prints full CMYK with Pantone PMS matching. Recycled-content board runs across the range, with hand holes and fitted inserts cut to the freight.
Two and three-flute walls for weighty cargo
Bolstered angles at the pallet pressure joints
Leading edge-crush figures for tall piling
Punched grips and shaped inserts to the freight
Reclaimed-fibre stock at every build
No floor, so a dense-goods order stays modest
Heavy Duty Shipping Boxes: Reinforced Wall Construction
Why Triple-Wall Exists
Some freight simply crushes anything thinner: dense industrial parts, high-value equipment, bulk cases stacked several pallets high. Triple-wall board puts three fluted layers between liners so the carton carries loads a single or double wall would buckle under. Packify specifies it where the weight and the stacking demand it, because under a heavy pallet column the wall count is the only thing standing between the goods and damage.
Corners Are the Failure Point
A box under a stacked load fails at its corners first, where the vertical column concentrates. Reinforcing those stress points keeps the walls square through warehouse stacking and a rough parcel network. Packify braces the corners on heavy-duty builds rather than trusting flat board to hold, which is the difference between a carton that arrives square and one that arrives bowed and unstackable.
Reading the Edge-Crush Number
For heavy freight the edge-crush grade is the specification that matters, because it states in a number how much stacking pressure the wall holds. It is a board property, not a printed badge. Packify specifies a top ECT grade to the pallet column a shipment sits under, so a buyer matches the carton to real handling rather than hoping a generic box copes with a load it was never rated for.
Inserts Hold Heavy Goods Still
A dense product loose in a heavy-duty box becomes a battering ram against its own walls in transit. Fitted corrugated inserts and dividers hold the freight still so its mass works with the carton rather than against it. Packify cuts the inserts to the actual product, because on a heavy shipment the interior fit protects the goods as much as the wall grade protects the box.
Heavy Duty Shipping Boxes: Reinforced Wall Construction
Heavy duty shipping boxes: double and triple-wall board with reinforced corners for dense goods
Treble Layer
Three flutes shoulder heavy and costly cargo. Stock runs thickest at this build. Crush forces meet resistance.
Girded Angle
Bolstered corners absorb what a piled pallet presses down. Weak joints thicken. Sides keep their shape.
Steep Crush Rating
A leading edge-crush figure grades the tower it endures. Digits fix the strength. Tall piles stay true.
Frequently Asked Questions
Mailer boxes are a category of shipping box with a self-locking tuck closure that requires no tape. All our mailer boxes are engineered for postal and parcel carrier shipping.
Through board grade. We specify single, double, or triple-wall board by edge-crush rating to the weight and stacking load, with reinforced corners on heavy builds. The ECT figure is a measured board spec, not a badge.
Yes. Full-color interior printing is available on all mailer box styles. The interior print creates a brand experience at the moment of highest customer attention.
Reorders produce in 8-10 business days, the same as a first run, since your artwork and dieline are already approved and retained.
Yes. We can split a single production order across multiple delivery addresses, shipping portions to different warehouse or fulfillment center locations.
We have no minimum order quantity. You can order as few as 1 unit or as many as 100,000+. Pricing scales with quantity, so larger orders receive significant discounts.
Standard production is 8-10 business days after artwork approval. Free dieline and design support runs before production begins.
Get a Custom Quote for Heavy Duty Shipping Boxes
No minimum order, free design support, and free US shipping on every shipping packaging order.
+1 213-224-8421 (24/7 Support)
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Shipping Packaging Capabilities
No MOQ, 8-10 business day production, free shipping in the continental US, and Pantone PMS color matching on every shipping packaging order.
DIM Weight Sizing
Box dimensions cut close to the product, so a parcel is billed for the goods rather than the air around them.
ECT-Graded Board
Single, double, and triple-wall board specified by edge-crush rating to the weight and pallet stacking load a shipment carries.
Fulfillment Line Efficiency
Self-locking closures eliminate tape, reducing assembly labor and increasing pick-pack throughput per hour.
Multi-SKU Sizing
Multiple box sizes in the same order with consistent branding across your full product catalog.
Reorder Programs
Retained files and order history for fast 8-10 day reorders without repeating artwork approval.
Direct to 3PL Delivery
Free delivery across the continental US, including your 3PL warehouse or multiple fulfillment center locations.