What is High Cube Container?
A high cube container is a dry freight container that is one foot taller than standard, with an external height of 9 ft 6 in (2,896 mm) instead of 8 ft 6 in (2,591 mm). The most common size is the 40-foot high cube, classified in ISO 668 as type 1AAA and coded 45G1 under ISO 6346, where the '5' denotes the 9 ft 6 in height. Length and width are the same as standard boxes, 12,192 mm long and 2,438 mm wide for a 40-foot. 45-foot high cubes and high cube reefers also exist, and 20-foot high cubes are available but less common. The extra height gives roughly 12 percent more internal volume than a standard container of the same length, without changing floor area.
Why it matters for forwarders
High cube boxes suit light, voluminous cargo such as furniture, apparel, foam or e-commerce goods, where volume rather than weight limits the load. They are now the dominant 40-foot equipment in many trades, so availability is often better than 40-foot standard boxes. Overall vehicle height can exceed limits on some road and rail routes, especially where the EU's general 4.00 m height limit or local bridge clearances apply, so check inland routing. Make sure the booking specifies 40HC rather than 40GP, as a substitution can leave cargo short-shipped. Reflect the extra height in stowage plans: pallets stacked to 9 ft need a high cube to fit.