http://PortableStorageSanDiego.com San Diego. Portable Storage Comes To San Diego via Pack Rat! In recent years, the use of portable storage units in San Diego has grown in renown. Portable storage units in San Diego are large containers that are used to hold items that you want to move. Most people make use of these units when they are moving or relocating to another area. A storage company will drop off the unit. The customer will then load the unit with their items. The company then picks up the container and drops it off at the new residence.