A container of monocoque construction having a peripheral wall (1) comprised of concentric inner and outer walls (2, 3), the space (6) between them being filled with a plastics material. At least one of the inner and outer walls is a spirally-wound tube; preferably both are spirally-wound tubes with their raised seams (4, 5) projecting into the space (6) between them. The container is particularly adapted to form the body of a waste compactor or for use as a bulk container for both fluid and particulate materials. The preferred waste compactor vehicle comprises a monocoque container (1) substantially horizontally disposed along the longitudinal axis of the vehicle with inbuilt compaction (15, 21) means at one or both ends of the container.