drums, crates, and any heavy or bulky out-of-gauge cargo, like machinery, semi-finished goods or processed timber. Empty flat-racks can either be stacked or shipped sideways in another ISO container collapsible containers, ranging from flushfolding flat-racks to fully closed ISO and CSC certified units with roof and walls when erected.[54] Containers for Offshore use have a few different features, like pad eyes, and must meet additional strength and design requirements, standards and certification, such as the DNV2.7-1 by Det Norske Veritas and the European standard EN12079: Offshore Containers and Associated Lifting Sets.[55] A multitude of equipment, such as generators, has been installed in containers of different types to simplify logistics – see containerized equipment for more details. Swap body units usually have the same bottom corner fixtures as intermodal containers, and often have folding legs under their frame so that they can be moved between trucks without using a crane. However they frequently dont have the upper corner fittings of ISO containers, and are not stackable, nor can they be lifted and handled by the usual equipment like reach-stackers or straddle-carriers. They are generally more expensive to procure.[56] Specifications[edit] Two 45-foot High-cube containers on a Roll-on/roll-off (RoRo) tractor. The 9 ft 6 height of the boxes is identified by diagonal yellow and black markings on the top corners of the container Basic dimensions and permissible gross weights of intermodal containers are largely determined by two ISO standards: [nb 12] ISO 668:2013 Series 1 freight containers—Classification, dimensions and ratings ISO 1496-1:2013 Series 1 freight containers—Specification and testing—Part 1: General cargo containers for general purposes Weights and dimensions of the most common standardized types of containers are given below.[nb 13] Values vary slightly from manufacturer to manufacturer, but must stay within the