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.

✅ Key Features

• Dimensions (Internal): 18" x 18" x 28"

• Strength: Double-wall construction for superior durability

• Board Grade: 48 ECT (Edge Crush Test) – exceeds standard shipping requirements

• Thickness: 1/3" heavy-duty kraft corrugated

• Eco-Friendly: 100% recyclable & sustainably sourced

• Weight per Box: 3.6 lbs

• Made in USA – consistent quality and durability

📊 Product Specifications

💡 Best Uses

• Heavy or bulky household goods (appliances, books, cookware, tools)

• Fragile shipments requiring extra protection

• Industrial, warehouse, and e-commerce fulfillment

• Long-distance shipping (ground, rail, sea, or air)

• Moving boxes for sturdy packing of valuables

📦 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.