Inside Amazon’s Warehouse, the world’s largest online retailer, owns 80 enormous warehouses or fulfillment centers around the globe to serve the 30 million customers that use buy stuff through the portal. These warehouses are massive, with a singe building taking up 1.2 million-square-feet and containing miles of conveyor belts. The logistics of running a single warehouse with millions of items are mind-boggling, even before you add in the fact that Amazon doesn’t use any robots. Everything is tagged, placed and moved around by human hands. Even more stupefying is the fact that Amazon doesn’t store items in an organized way. Everything is stored at random but their location tagged with barcodes. Amazon calls the system 'chaotic storage,' and this is one the key factors to's success in online retail.