Pallet rack is used for bulk storage and to support full-case picking (Fig-ure 5.1). Pallet length and width are reasonably uniform and pallet rack provides appropriately-sized slots. The height of slots can be adjusted, however, as pallet loads can vary in height.
The advantage of rack storage is that each level of the rack is independently supported, thus providing much greater access to the loads, and possibly permitting greater stack height that might be possible in floor storage.
The most common types of rack storage are: