Here we have a basic vertical stack. In this stack, the cut come from the back of the stack in order to provide the greatest possible space to cut into.
The vertical stack works by "creating" spaces on the sides of the field for cutters to move into. Additionally, the "backfield", which is the space behind the disc, is open for the reset cut by the other handler. We place the reset or "handler" on the break side for several reasons: first, so that they do not clog the open side with themselves and their defender. Second, so that they have the openside of the field as a cutting option. A third reason is to start them away from the in cuts, to guarantee that the cutters will not interfere or cut across the reset option. Note: the deep field (the area beyond the last cutter) is also open for a deep option.
The first cut initiates it's movement by seting up their defender deep. By making this movement, they create a cutting space inwards, and decieve thier defender into thinking they may be going deep.
The cutter stops their motion deep and recuts back towards the disc. Note that the cut does not go straight to the disc, but moves at and angle towards the open space.
If the disc is not received on the in cut, the cutter clears out of the space, taking their defender with them. This allows for addtional cutters to move through that space.
If the player is looking for a reset option, the helping handler has both the backfield and upline options.
The greatest weapon of the vertical stack is the "Break Side", which is the (typically) unguarded area opposite to the forced side. Here, the defensive mark is forcing the thrower to the right, and the remaining defenders are guarding that side in anticipation.
A break side cut, is more difficult to complete; however, if a break throw is completed, is creates an abundance of open space, and generates a chaotic scrabble for the defense to recover.
For more experienced teams with better timing, speed, throws and flow that want to maximize the effectiveness of this strategy, I would recommend extending the stack further down field, so that your cutters have more space to work with and can more easily generate continuous upfield flow. But for more novice teams, keep a compact and efficient stack so that the cuts/throws are shorter and the consistency is greater.