Abstract: A container assembly outfits a wide mouth container and thereby enables a user to single-handedly grasp and transfer the container. The container assembly comprises a lid portion and a content cover. The lid portion comprises at least one rim-locking portion and at least one hand-grippable flange. The rim-locking portion(s) are inwardly adjacent to the hand-grippable flange(s). A spillage basin may be formed inwardly adjacent to the rim-locking portion(s). The content cover contacts and covers container contents. The content cover also comprises a spillage basin and is displaceable intermediate a rim portion and a bottom portion of the container, and thus be said to ride upon the container contents as the volume of container contents changes. The spillage basins collect and retain spillage for easing spillage cleanup. The content cover is outfitted with certain structure for easing removal of the content cover and the container contents.