Abstract: A flip-top cap is provided in which an upper portion is secured to a lower portion by means of a living hinge. An outer skirt forms a lever with an integral radial connecting wall on a side of the cap opposite the living hinge. The outer skirt and the radial connecting wall may be elastically deformed to permit a detent on the upper portion of the cap to escape a recess on the outer skirt for opening the cap. The radial connecting wall is lowered and thinned with respect to heretofore known designs, facilitating opening of the cap. Integral ribs are provided on the base and flip-top portions to prevent twisting and/or lateral movement of the upper portion that could allow for inadvertent opening of the cap.