Abstract: A freight carrier having a base structure forming a freight carrying platform which is provided at each corner with a corner post pivotally mounted for movement between an upright erect position and a folded position in which the post lies parallel to the platform. An interlocking mechanism is provided at each corner of the carrier to enable the carrier with the corner posts in their folded position, to be interlocked with a similar carrier which is stacked thereon and the interlocking mechanism includes a clamping arrangement to enable the stacked interlocked carriers to be clamped together. The interlocking mechanism is also arranged to lock an associated corner post in the erect position and clamps the corner post to the base structure in this erect position.