The object of the invention is to provide a boat which has two configurations, a package configuration in which the boat is folded and nested into a compact package (fig. 5) for transport and storage and a boat configuration (fig. 1) in which the device is assembled into a rigid boat for operative use. The boat is separable into two or more transverse sections (8, 9). Each section is divided into a port and a starboard portion (10, 11, 12, 13) which hingedly fold together to reduce the package width. The folded sections nest within one another to reduce the package length. The package configuration thereby has a shorter length and width than the boat configuration. Fastening devices (18) are provided for securing the unfolded portions and sections together to provide a solid structure in the boat configuration.