Abstract: This invention relates generally to a portable beverage container holder and cover. More specifically, the invention is a floatable, insulated, beverage container holder, having an external tubular foam shell, and a two-piece device, comprising a dome-shaped cover portion and an annular collar portion. Hinged means, comprising of a rod connected to two ear shaped upwardly extended projections, is integrally formed with the annular collar, enabling the dome-shape cover to pivot between a forwardly closing position and a backwardly open position. The collar includes a recess in the rear of the hinge for receiving a locking projection correspondingly disposed at the back of the dome shaped cover. A frictional engagement between these corresponding parts retains the cover in an upright locked position, when it is pivoted backward. Similarly, the cover is adapted to snap into a watertight seal when it pivots forwardly into a closed position.