A cargo optimizing device includes a first and a second cargo platform pivotably attached to a center shaft. The first and second cargo platforms have transverse and longitudinal support members. When unfolded into a cargo support configuration, the device forms a planar cargo support. The device has a two-part platform frame in which the members are suspended and can be folded around the central shaft for storage. Support legs are pivotably attached to the frame and retractable rollers extend from the periphery. The device is modular: the transverse members slide to bridge to a second device. The frame and the attached longitudinal members have apertures aligned to accommodate the sliding transverse members. The cargo optimizing device forms a second stacking level in a shipping container which otherwise has an upper level of unused space. The device can be supported by legs or suspended by belts.