inches for a paperboard that is 0 020 inches thick when the radius of a can is 1 25 inches the dimension for the triangle opposite side s is computed by the pythagorean theorem to be approximately 0 55 inches subtracting this value from radius value 1 25 inches provides an approximate dimension of 0 70 inches for the length from the seam 81 to the fold line 69 the amount subtracted from the radius can also be expressed as the square root of the following the diameter of the can times the effective height of the folded flap minus the square of the effective height of the folded flap in practice the paperboard material and the clearance of cans inside a carton can provide reason to increase or decrease this dimension in the embodiment shown the double folded flap 6 is sufficiently long so that it holds the can 200 at a position completely within the carton 100 when the can 200 is fully within the carton 100 the can 210 and the can 220 are stacked in vertical alignment above the can 200 and the mass of the cans 210 220 is nearly balanced therefore there is little or no force upon the can 200 biasing it toward the dispenser opening this is a fourth means by which the present invention prevents inadvertent ejection of cans.