Rent-A-John can provide long-term storage solutions for your job site. 20’ construction storage containers come with welded-hinge construction providing security for all your materials and equipment. Shipping containers come in a variety formats, including high cube, side opening, open tops, and flat racks. The original and most popular however continues to be the general purpose standard container – an incredibly tough and resilient container made out of marine grade Corten steel (a special type of steel which actually offers more protection as it weathers) and has wooden floors, double swing doors, and internal anchor points.