About... Push Back Racking This back storage system has all its pallets on trolleys that is pushed back on rails, except for last pallet which is placed on the rails. It allows you to store up to four pallets deep per level. Advantages include minimum loss of space in height, because of a specially designed system and ideal for storage of products with an average turnover, with 2 or more pallets per SKU.Unlike other systems, each level can store a different SKU. Similar to Drive-In Racking, however each picking face can be accessed at any time, still utilising 85% of your floor space.