Push back racking combines the self-positioning feature of flow racks with the high density of drive-in systems. Push back racking uses carts to store pallets on that nest into each other and slide back & forth on a rail typically 2-6 pallets deep (some systems go deeper). This system allows each pallet position and the pallets directly behind it to be selected. As you load each pallet, you “push” the pallet already in place back until you reach your depth capacity, thus giving you more selectivity over a drive-in system for example. This would be considered FILO (first pallet in, last pallet out) otherwise known as LIFO (last pallet in, first pallet out). A push back rack is ideal for LIFO and FIFO systems, with up to 75 percent more storage capacity than a selective rack system.