Abstract: A flag tag system for removable mating with a resilient cylindrical cup-shaped member defining a socket includes a flag retention frame connected to the flag, a post connected to the flag retention frame, and a plurality of discs or arms connected to the post, the plurality of discs or arms for mating with the socket. The flag tag system is for a flag football or similar tag game using a flag that is pulled by force to tag a player. A first device with the shaped member defining the socket is worn on a belt by the player. The plurality of discs or arms mates by pressing into the socket of the shaped member. The flag retention frame carries a flag. The plurality of discs or arms can provide select pull or force tension for grabbing the flag and thereby popping the discs or arms from engagement with the socket of the shaped member. Embodiments also include a buckle system of a plug with arms for snug connection to a socket.