What is Out of Gauge?
Out of gauge (OOG) cargo is cargo whose dimensions exceed the internal length, width or height of a standard container, so it cannot be stuffed inside a closed box and travels on a flat rack or open top container with parts extending beyond the container's outline. Over-height cargo projects above the container, over-width cargo beyond its sides and over-length cargo beyond its ends. Under ISO 668, standard containers are 2,438 mm wide externally and 2,591 mm high, or 2,896 mm for high cube units, so cargo extending past these lines interferes with neighbouring stowage positions. Cargo too large or heavy even for flat racks usually moves as breakbulk or on project and heavy-lift vessels. OOG sits between container and breakbulk logistics and needs engineering, lashing plans and often road permits.
Why it matters for forwarders
Carriers commonly price OOG according to the slots lost around the unit, because overhanging cargo blocks adjacent positions, so dimensions accurate to the centimetre and a lifting and lashing plan are needed before a booking is confirmed. Most carriers require approval from a special cargo desk, drawings showing centre of gravity and lifting points, and stowage on deck or on top of stacks, and some vessels and terminals cannot handle certain units at all. Inland legs are often the binding constraint: over-width and over-height loads may need permits, escorts, route surveys and restricted travel windows, which add cost and lead time. The CTU Code gives non-mandatory guidance on packing and securing cargo in cargo transport units, and the shipper remains responsible for declaring a verified gross mass under SOLAS. Allow extra time for terminal acceptance, as OOG units often have specific delivery windows and handling charges.