Abstract: A convertible childproof to non-childproof bottle comprising a container that has a mouth opening, a lid selectively movable between a closed position in which it closes the container mouth opening and an opened position in which it clears the container mouth opening for allowing access into the container, complementary interlocking and releasable first container and lid locking elements respectively located on the container and the lid engageable to releasably lock the lid in the closed position, and complementary interlocking and releasable second container and lid locking elements engageable to additionally releasably lock the lid in the closed position.