a portable cosmetic container basically comprised of a container , cover , and hinge pin , all fabricated from synthetic resin to allow the container to be recycled as a completely plastic item while providing a stable free - stop function . the hinge structure includes a hinge pin inserted within a continuous bore formed in a hinge block integrally formed on the cover part , and a hinge body integrally formed on the container part . applying friction to said hinge pin maintains the cover at any angular open position through friction between the hinge pin and hinge block hole by a slight interference fit between the hinge pin and hole . splines are gouged in the hinge block hole to prevent rotation of said hinge pin . the spline fixedly secures the hinge pin within the hinge body through interference fit joint .