Abstract: A tennis ball pack apparatus for dispensing balls in one mode of operation while positioned on a player's back and retrieving balls in another mode of operation upon removal from the back. An elongated housing which is strapped to the player's back includes two pairs of spaced walls which have different lengths to define predetermined openings adjacent to an oblong shaped bottom made up of flexible connected rod members. During the ball dispensing mode the player grips a ball through an opening and pulls against the flexible rod members to dispense the balls in seriatim. A U-shaped frame which is in slidable engagement with the walls of the housing is movable from a first position closely adjacent to the housing when operating in the ball dispensing mode while on the player's back to a second position extended from the housing when operating in a ball retrieving mode upon removal of the housing from the player's back.