18x18x28 Heavy-Duty Double Wall Shipping Box - Extra Strong Corrugated Cardboard
💪 Built for Heavy-Duty Shipping & Storage
1 Box per order, for Bundle Quantities contact us directly
Our 18" x 18" x 28" double wall corrugated boxes are engineered for maximum strength and protection. Made with 48 ECT, 1/3" thick kraft corrugated board, these cartons can withstand the toughest shipping, moving, and storage demands. Perfect for bulky, heavy, or fragile items, these boxes deliver reliability you can count on.
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✅ Key Features
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Dimensions (Internal): 18" x 18" x 28"
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Strength: Double-wall construction for superior durability
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Board Grade: 48 ECT (Edge Crush Test) - exceeds standard shipping requirements
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Thickness: 1/3" heavy-duty kraft corrugated
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Eco-Friendly: 100% recyclable & sustainably sourced
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Weight per Box: 3.6 lbs
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Made in USA - consistent quality and durability
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📊 Product Specifications
Specification Detail
Inside Dimensions 18" x 18" x 28"
Material Double Wall Corrugated
Board Grade 48 ECT
Wall Thickness 1/3"
Box Weight 3.6 lbs
Sustainability Recyclable Kraft
Country of Origin USA
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💡 Best Uses
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Heavy or bulky household goods (appliances, books, cookware, tools)
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Fragile shipments requiring extra protection
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Industrial, warehouse, and e-commerce fulfillment
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Long-distance shipping (ground, rail, sea, or air)
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Moving boxes for sturdy packing of valuables
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📦 Why Choose Double Wall?
Double wall boxes offer nearly twice the strength of standard single-wall cartons. The two layers of corrugated fluting provide outstanding resistance to crushing, stacking, and rough handling-making them the best choice for heavy-duty packaging.
