http://www.rackline.com/mobile-storage-systems/

Mobile storage is the perfect way of increasing your storage capacity or reducing your storage footprint

in fact by using mobile shelving in comparison to conventional static shelving in a working environment you can increase your storage capacity by up to 70 on the other hand if you wish to reduce your storage footprint by applying mobile storage you can achieving savings of up to 50
http://www.rackline.com/mobile-storage-systems/