3D Load Packer (3DLP) is the unique space optimizer designed to help you plan quickly and easily the best compact arrangement of a number of different size 3D rectangular objects (hereafter called "Boxes") within one or more rectangular enclosures (hereafter "Containers"). 3DLP is based on the truly three-dimensional, most dense and quick original packing algorithms. The program may be used to optimize multi-product load plans for any rectangular containers, trucks, trailers, railcars, crates, pallets and boxes, as well as be applied to any other 3D-space optimization problem. 3D Load Packer can optimize over multiple containers in multiple sizes at the same time, taking into account overall box set considered and allowed box space orientations, specified for each box separately or for all boxes together. An overall load weight limit and truck axle weight limits may be taken into account as additional constraints or actual optimization factors. Full control on the allowed box overhang is also available. The program has a facility for specifying the associated cost for each box / container item in order to calculate totals and affect upon optimization as additional priority factors. Optimizer goal and other main settings are adjustable. Typically, optimizer reduces volume waste by a factor of 1.5 - 2 with respect to manual load planning.