Shipping containers are purpose-built to withstand years of rough ocean travel. The marine-grade steel construction and the coating is rust-resistant. Dial-A-Box containers are new and have never been used at sea; therefore, ours are free of rust. Shipping containers are also waterproof to harsh rain, storm and snow conditions. All Dial-A-Box self-storage shipping containers in Ballarat are fitted with numerous rainproof air vents along the top side edges. We recommend storing dry items for the best storage results.