The main difference between storage containers are whether they are a roll-off or shipping container style. Various names can describe the same thing, such as a cargo/shipping container, conex box (connex box), portable storage container, mobile storage container, and domestic containers. Typically the name changes depending on your location and or region. Steel cargo storage containers are wind and water tight, which are great for securing and storing items you do not want exposed to the elements. Roll-off containers are not wind and water tight, however, they also are secure steel containers that are especially sought after for use on jobsites and construction projects, or for additional outdoor storage on your property.