Adjustable container for intermodal transportation of goods comprising - a fixed central part corresponding, for example, to a 20ft ISO container that is open on the first transverse lateral face thereof and on the second, opposite transverse lateral face thereof, the central part comprising four corner pieces on the upper face thereof and four corner pieces on the lower face thereof, - a first lateral part corresponding, for example, to a 10ft ISO container that can be nested in the fixed central part via the first transverse lateral face, the first lateral part being integral with the fixed central part by means of an integral system, this integral system comprising a first linear guiding system allowing the first lateral part to move relative to the fixed central part, the first lateral part comprising two removable corner pieces on the upper face thereof and two removable corner pieces on the lower face thereof, - a second lateral part corresponding, for example, to a 10ft ISO container that can be nested in the fixed central part via the second transverse lateral face, the second lateral part being integral with the fixed central part by means of said integral system, the integral system comprising a second linear guiding system allowing the second lateral part to move relative to the fixed central part, the second lateral part comprising two removable corner pieces on the upper face thereof and two removable corner pieces on the lower face thereof, the first lateral part and the second lateral part being able to move in the direction of the length of the fixed central part and deployable on either side of the fixed central part between a configuration when the two lateral parts (2a, 2b) are entirely merged with the fixed central part, in which configuration the adjustable container is said to be in a compact configuration and a configuration in which the adjustable container is said to be in an elongate configuration, the adjustable container in the compact configuration corresponding, for example, to a 20ft ISO container, the adjustable container in the elongate configuration corresponding, for example, to a 40ft ISO container, the dimensions of the adjustable container in the elongate configuration are greater than those of the adjustable container in the compact configuration. - a fixed central part corresponding, for example, to a 20ft ISO container that is open on the first transverse lateral face thereof and on the second, opposite transverse lateral face thereof, the central part comprising four corner pieces on the upper face thereof and four corner pieces on the lower face thereof, - a first lateral part corresponding, for example, to a 10ft ISO container that can be nested in the fixed central part via the first transverse lateral face, the first lateral part being integral with the fixed central part by means of an integral system, this integral system comprising a first linear guiding system allowing the first lateral part to move relative to the fixed central part, the first lateral part comprising two removable corner pieces on the upper face thereof and two removable corner pieces on the lower face thereof, - a second lateral part corresponding, for example, to a 10ft ISO container that can be nested in the fixed central part via the second transverse lateral face, the second lateral part being integral with the fixed central part by means of said integral system, the integral system comprising a second linear guiding system allowing the second lateral part to move relative to the fixed central part, the second lateral part comprising two removable corner pieces on the upper face thereof and two removable corner pieces on the lower face thereof, the first lateral part and the second lateral part being able to move in the direction of the length of the fixed central part and deployable on either side of the fixed central part between a configuration when the two lateral parts (2a, 2b) are entirely merged with the fixed central part, in which configuration the adjustable container is said to be in a compact configuration and a configuration in which the adjustable container is said to be in an elongate configuration, the adjustable container in the compact configuration corresponding, for example, to a 20ft ISO container, the adjustable container in the elongate configuration corresponding, for example, to a 40ft ISO container, the dimensions of the adjustable container in the elongate configuration are greater than those of the adjustable container in the compact configuration.