Abstract: A utility container configured for use with an open-topped vessel, which container comprises a receptacle having an open top and a closed bottom and is configured to permit the receptacle to be received within the vessel. The container further has a depth-limiting structure for limiting the depth of travel of the receptacle within the vessel. Other features of the container include a lid for providing impermanent closure for the receptacle, partitions for establishing sections within the receptacle, adjustable partitions for defining sections within the receptacle according to a user's choice, and a handle-engagement structure for engaging the handle of a handled-vessel and locking the container with respect to the handled-vessel to form a unitary assembly.