These 18 x 18 x 18 inch double wall corrugated boxes carry an ECT-71 rating, placing them firmly in the heavy-duty tier of corrugated packaging. Double wall construction sandwiches two medium flutes between three linerboards, delivering substantially greater crush resistance and stacking strength than standard single wall alternatives at the same footprint. The 3.498 lb per-box weight reflects the added board mass inherent to ECT-71 grade material.

The equal-dimension cubic format handles dense, heavy, or irregularly shaped contents without wasted void space, making these boxes a practical fit for outbound manufacturing shipments, industrial parts distribution, automotive components, and high-weight e-commerce fulfillment. Operations running continuous outbound volume benefit from the consistent cubic footprint when palletizing mixed loads.

Boxes arrive flat for space-efficient storage and are sold in bundles of 10. Ships via parcel carrier.