endless conveyor belt 60 fig4 illustrates that the product from the several bins forms layers on the belt 60 with layer a being the product discharged from bin 1 layer b being the product discharged from bin 2 and so forth the particulate product is discharged from belt 60 to a packaging station not shown in operation of the embodiment illustrated in fig3 each of bins 1 2 3 4 and 5 will be empty at the beginning of the operational cycle particulate polymer such as pelleted polyethylene is fed via line 50 to the first valve 52 and through the first line 54 this material begins to fill compartment a of bin 1 after compartment a is filled the polymer particles flowing into bin 1 overflow wall 32 and being filling compartment b this action is continued until each of the compartments of bin 1 is filled the flow of the particulate polymer to bin 1 will be measured and first valve 52 will be closed at the appropriate time so that the volume of particulate polymer charged will be to the extent practical precisely equal the volumetric storage capacity of the several storage compartments of the bin it will be recognized that some free space will remain above each of the storage compartments of the bin this is desirable for reasons discussed infra after bin 1 is filled bins 2 3 4 and 5 will be filled in sequence in the same manner after all of the bins have been.