A system for stacking freight within a shipping container is disclosed. The system comprises a first pallet configured to be removably affixed below and have vertical relief from a second pallet when the system is in a fully assembled state. The system also includes a second pallet configured to be removably affixed on top of and have vertical relief from the first pallet. The system also includes a plurality of support members vertically arranged to support the second pallet on top of the first pallet and provide vertical relief between the first and second pallets when the movable modular system is in the fully assembled state. A plurality of fasteners are used to removably attach the ends of crossing support members to the vertically arranged support members when the system is in the fully assembled state.