Exact container specifications may vary slightly by carrier. Most containers are 8 feet wide, although 8.5-foot widths have become available from some carriers. Container lengths generally range from 20 to 53 feet, with 20-foot and 40-foot containers being the two most common. Height is usually 8.5 feet, but may be 8 feet or 9.5 feet, which is known as a “high cube.” There are also many types of specialized containers, such as platform containers (one foot high), bins (four feet high), and flat rack containers of varying sizes.