Flat-Ship Packaging Engineered to Pop Up Instantly with Rigid 90° Corner Strength
Pre-glued four-corner folding carton trays and boxes engineered to ship 100% flat and assemble instantaneously with sturdy 90° corner gussets.
Custom four-corner boxes (including Beers trays and 4-corner infold/glued lidded cartons) are pre-glued paperboard and micro-flute structures that ship 100% flat and pop open into rigid, leak-resistant 90-degree corner trays in one motion. Manufactured from 16pt–24pt SBS, C1S kraft, or E-flute corrugated board with optional grease-resistant PE/PLA inner coatings, they serve bakeries, confectionery, takeout food service, and retail apparel. Wholesale orders start at 250 units from $0.44/unit with 10–14 business day production and Always Free DDP Shipping.
*Written by the Cubit Packaging engineering team. Technical specifications verified by packaging structural specialists with 10+ years in paperboard carton converting. Last updated June 2026.*
A four-corner box—frequently designated in commercial packaging converting as a four-corner beer tray or pre-glued lock-corner folding carton—is an advanced paperboard packaging format engineered with precision diagonal 45-degree corner gusset scores. The corner tabs are pre-glued on high-speed automated folder-gluers during primary manufacturing. This allows the cartons to ship 100% flat to your fulfillment facilities, slashing pallet footprint and inbound freight expenses by up to 80% compared to rigid set-up boxes, while popping open into rigid 90-degree upright trays in approximately 1 second flat.
"By combining pre-glued diagonal gusset kinematics with high-caliper 18pt–28pt SBS paperboard, four-corner boxes deliver the pristine aesthetic presentation of a luxury rigid gift box with the operational pack-out speed and freight efficiency of a folding carton."
Every four-corner box produced at Cubit Packaging is stamped using high-accuracy steel rule dies calibrated to ±0.5mm tolerances. The 45-degree diagonal score creases allow the carton to collapse completely flat during transit and snap into rigid shape with a simple squeeze of opposite corners:
"For growing DTC apparel and artisan food brands, transitioning from hand-tucked cartons to pre-glued four-corner trays reduces per-unit packing labor costs by over 45% while eliminating freight dimensional weight penalties."
Our four-corner boxes can be specified with certified FDA 21 CFR §176.170 grease-resistant and moisture-impermeable aqueous barrier coatings for direct food contact. These coatings prevent butter, oil, and moisture migration from pastries, artisan donuts, and gourmet baked goods without sacrificing compostability or paper recycling stream compatibility. All virgin wood fibers originate from responsibly managed FSC-certified forests, ensuring your packaging communicates premium luxury and circular sustainability at every touchpoint.
See how businesses across different sectors use this packaging
Shallow 14x10x3 inch fold-flat apparel cartons engineered to cradle folded silk shirts, cashmere scarves, and boutique garments with pre-glued corner strength.
Food-safe barrier-coated four-corner cake and pastry trays that fold flat in bakery prep stations and pop open instantaneously during counter checkout.
Square telescoping two-piece or hinged four-corner boxes fitted with custom compartments to hold artisanal truffles and confectionery treats.
High-end beauty kit trays with custom die-cut paperboard inserts that present dropper bottles, cream jars, and lipsticks in a structured reveal.
Deep four-corner cartons engineered with heavy 24pt board to safely cradle scented glass candles, reed diffusers, and luxury room sprays.
Flat-shipping cartons that maximize fulfillment pack speed with 1-second pop-up corners and deliver unforgettable unboxing delight upon delivery.
Choose materials, printing, and finishing options
Ultra-smooth clay-coated virgin white paperboard engineered for crisp 2400 DPI litho printing, sharp fold definition, and luxury cosmetic unboxing.
Extra-rigid 0.024-inch caliper virgin paperboard providing supreme vertical stacking resistance and zero sidewall bulging for heavy luxury goods.
Natural brown wood-fiber substrate with high tensile tear strength and authentic sustainable aesthetics for organic food and artisan DTC products.
Cost-effective recycled paperboard with a smooth clay-coated white print exterior and recycled kraft/grey interior for high-volume retail merchandise.
Unmatched tear and wet-strength virgin pine fiber board formulated for heavy hardware, beverage samplers, and chilled bakery presentations.
Ultra-reflective foil laminated directly onto sturdy paperboard, allowing luminous metallic gold, silver, and holographic effects under transparent inks.
FDA 21 CFR §176.170 compliant grease-resistant and moisture-impermeable aqueous barrier coating designed for direct contact with pastries, cakes, and gourmet snacks.
Diverted post-consumer paper fiber board offering authentic unbleached raw tactile character and minimal carbon manufacturing footprint.
From concept to delivery in 4 simple steps
Share your requirements and get a detailed quote within 15 minutes during working hours. Our team reviews every project.
Receive a digital 3D mockup. Request unlimited revisions until you're 100% satisfied.
Your packaging enters production. Track progress through your dashboard in real-time.
Free shipping to your door. Standard delivery in 7-14 business days. Need it faster? Rush production delivers in 3-7 business days.
We offer sustainable alternatives for Four Corner Boxes that don't compromise on quality. Choose eco-friendly materials and printing options to reduce your environmental impact.
100% Recyclable
Made from recyclable materials
FSC Certified Options
Responsibly sourced materials
Soy-Based Inks
Eco-friendly printing
Carbon Neutral
Offset shipping available
Complete technical specifications for Four Corner Boxes
| assembly speed | Approx. 1 second per unit (pre-glued corner gusset kinematics) |
| finishing options | Soft-Touch Matte Lamination, High-Gloss UV, Anti-Scuff Poly, Spot UV, Hot Foil Stamping, Multi-Level Embossing |
| structural styles | Four Corner Beer Tray, Four Corner with Telescoping Lid, Four Corner with Hinged Fold-Over Cover |
| die cut tolerances | ±0.5mm precision laser die-cut and scored edges |
| standard lead time | 10–12 business days (Rush 5–7 days available) |
| paperboard calipers | 16pt (0.016") to 28pt (0.028") |
| printing capabilities | HD Offset Lithography (up to 8 colors), Short-Run Digital, CMYK + Pantone PMS |
| minimum order quantity | 500 units (Digital) / 1,000 units (Offset Litho) |
| food safety certifications | FDA 21 CFR §176.170 Direct Food Contact Compliant, FSC Chain of Custody, 100% Recyclable Paperboard |
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