“Good Flag Designing” was formulated by Louis Loynes in 1969. It is one of the earliest known list of guidelines for the design of flags published after the establishment of vexillology as a separate discipline. Loynes was a noted English heraldic scholar; he was affiliated with The Flag Research Center from the 1960s until his death in 1976 as an expert in heraldry. He was also well-known for the high quality of his heraldic and vexillographic art, including his design of the heraldic zephyr that is the Center’s central device. Loynes’s list is among the first to express blanket considerations, both aesthetic and practical, that should be taken into account when designing a flag.