This article explains the basics of the vertical stack formation in ultimate frisbee. It is a type of offensive formation consisting of three cutters and three handlers arranged in a vertical line. The cutters, who are placed at the front of the stack, use their speed and agility to get open and create space. The handlers, who are located behind the cutters, act as decision makers, reading the defense to find open receivers. The vertical stack also allows teams to quickly transition from offense to defense and back.