A closure for a container is provided, including a first closure member with a male feature protruding from a first interface surface thereof. A retaining ring is configured to mate with and thereby attach the first closure member to the first flap. A second closure member has a female feature configured to receive the male feature defined through a second interface surface thereof. The second closure member also has retention tangs configured to mate with and thereby attach the second container flap to the second closure member. The male feature includes a stem with two flexible tabs extending acutely outward from the stem on opposing sides thereof. The flexible tabs are configured to snap fit into the female feature. The first and second closure members are respectively oriented such that the male feature mates with and releasably locks to the female feature when the first and second flaps are closed.