The invention relates to a method for manufacturing a double-walled tanker, comprising of providing a single-walled tanker with hold and arranging in the hold tanks having tanks walls placed at a distance from the outer wall of the tanker, wherein the method further comprises of providing rolled plates and of partially manufacturing the tank wall from the rolled plate. The invention also relates to a vessel, comprising a hold and at least one substantially box-like tank with tank walls received in the hold, wherein at least two mutually connected tank walls of a tank are formed by rolled plates with profile. The invention further relates to a container for products, comprising a number of side walls in a box-like configuration, wherein at least a bottom is formed by a rolled plate with profile in a longitudinal direction of the container.