18x18x28 Double Wall Shipping and Packing Box (1 Pack)

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 Specification Detail Inside Dimensions 18" x 18" x 28" Material Do