Patent ID: 8074821

Claim:
A container closure comprising an upper portion and a lower portion, wherein: said lower portion is configured to be attached to or to form a part of a container; said upper portion is moveable between a closed condition engaging said lower portion and an open condition disengaged from said lower portion; said upper portion has two opposing side wall regions; at least one of said upper portion side wall regions has an inwardly directed lower-portion-engaging portion moveable between a first position where said inwardly directed lower-portion-engaging portion engages said lower portion to resist opening of said upper portion, and a second position where said inwardly directed lower-portion-engaging portion moves outwardly from said lower portion to be disengaged from said lower portion to allow opening of said upper portion; and said upper portion and said lower portion have approximately the same perimeter dimensions so that when said upper portion is in said closed condition the perimeter of said lower portion, including side wall regions of said lower portion, generally aligns with the perimeter of said upper portion including said side wall regions and inwardly directed lower-portion-engaging portion of said upper portion.