Push back systems is ideas for storage of medium tunover products which two or more pallets per SKU . All the pallets on each level, except the last, are placed on a set of trolley that are pushed along a rolling rails . The rails are built on a slight incline, lower at the font .  Each level can be stored different SKU but It must be the same on per level , and are operated in “Last In First Out ” (LIFO) principle.