How to Improve Space Utilization With A Large Variety of Goods

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With a great variety of goods, is it possible to increase storage density, improving space utilization? 
Take a look at this European warehouse in the food industry. 

They placed 10 rows of 4-tier shuttle racks, with each aisle capable of storing 20 pallets. The plan is to use separate aisles for canned spices, bagged spices and fixed bases. Put another way, their solution is to use each aisle for one product and a total of 40 different types of products can be stored. With so many product categories, it is incredible how high-density storage can be achieved with shuttle shelving! 

Now there is a problem: if altogether 21 pallets of canned spices need to be stored, but there are only 20 pallets per aisle, what should they do with the extra pallet of canned spices? 
 

It turned out that they combined shuttle racks with heavy-duty racks so that separate goods could be placed on heavy-duty racks and accessed flexibly using a forklift truck. Through such a combination, the goal of high-density storage can still be attained.