48 x 6 x 38" Heavy-Duty Telescoping Inner Boxes

This heavy-duty telescoping inner box measures 48 x 6 x 38 inches interior and is constructed from ECT-44 kraft corrugated — an above-standard edge crush rating that delivers greater stacking strength and puncture resistance than conventional ECT-32 single wall cartons. The full overlap (FOL) bottom adds structural reinforcement at the base to resist failure under load.

The long, flat footprint makes this inner carton well suited for artwork, mirrors, cabinet doors, architectural trim, flooring samples, and similar oversized flat goods shipped through e-commerce fulfillment centers, furniture manufacturers, and building materials distributors.

This listing covers the inner box only; one inner and one outer carton are required to complete a functional telescoping set — pair with the corresponding outer carton (T48638OUTHD) to assemble the full unit. Each inner box weighs approximately 4.32 lbs. Sold in bundles of 10 and ships via parcel carrier.