Removable locking container cover

A container cover for use with a container having a neck with a rim. The cover includes a lid with a spout hole, a skirt extending downward from the circumference of the lid, a concentric plug seal extending downward from the lid inside the skirt, a spout hole door hingeably connected to the lid, and at least one non-flexing lock and one flexing lock, each having an inwardly projecting wedge, which lock the cover in place on the container by engaging the bead ring. The nonflexing lock wedge is preferably shaped as a truncated teardrop and positioned so as to facilitate removing the lid. When the cover is locked on the container, the plug seal provides a seal against the inside of the container neck. The spout door seals the spout hole when closed and prevents unlatching of the flex lock when open.