Kelly Storage containers are wind and watertight. Containers come in 20, 40, 45, and 48 foot container lengths. Storage Trailers come in sizes form 24 ft to 53 foot. Custom storage container sizes are available by request. Our storage boxes offer storage capacity suitable for your storage needs based on volume of your product and our container capacity. Are you looking for ground level storage or easy loading access from a dock? Please ask a member of our storage sales/rental force to evaluate your particular storage needs and fit our containers or trailers to your specifications. A custom container, by Kelly Container: the storage alternative that meets every storage need you can conceive of.