What is a stack formation in flag football and why use it?
A stack is two receivers aligned on the same track, one directly behind the other, rather than beside each other. Its job is a free release: the back receiver cannot be touched at the line without a defender going through his own teammate first. It also forces man defenders to sort out who has whom before the snap, standing in each other's way while they do it. Against zone it does very little, because zone defenders never had to follow anybody in the first place.
Stack, against man. Two defenders, two receivers, and only one clean path to the line between them. They have to trade before the snap, and whichever way they choose, somebody arrives late.
Why it works
The back man cannot be touched
There is no legal path to him at the line that does not go through the receiver in front. Whatever your league allows a defender to do with his hands, a stack takes it away from one of your receivers for free.
It forces a decision before the snap
Two defenders cannot both align on the outside shoulder of a stack, because there is only one outside shoulder. Whatever they choose tells you something, and they have to choose while you are still standing still.
It costs nothing
A stack needs no width, no extra receiver and no motion. It is a two-yard change to where one player stands, which is why it works for a team with one practice a week.
What to run from it
- MeshThe stacked pair cross underneath, and the traffic the alignment already created makes the mesh point almost impossible to defend in man.
- Double SlantsBoth receivers break inside off the same track, so one defender ends up covering the space the other one just left.
- Four VerticalsThe free release is worth most on a vertical route, because the back man is at full speed while his defender is still recovering.
- SmashA hitch under a corner route out of a stack, with the coverage having already declared its leverage for you.
How to line up in stack
- 1
Line the front man up normally
Wherever he would have stood anyway. He is not doing anything different; he is furniture for the man behind him.
- 2
Put the back man directly behind, not beside
One to two yards back and on the same vertical line. If a defender can see daylight between them it is not a stack, it is a tight split.
- 3
Check who has to be on the line
Most rulebooks require a set number of players on the line of scrimmage. The stack usually means the front man is on it and the back man is off it.
- 4
Give them different breaks
Two receivers running the same route out of a stack is one receiver. The value is that they leave one point in two directions.
What it gives you, format by format
5v5
The cheapest way to guarantee one receiver gets off the line clean, and at five a side that is often the whole game. It needs no extra bodies and no width, which is why it survives on a field where bunch and trips are competing for the same grass.
NFL Flag
Stack the centre behind a receiver and you have a snapper who releases into the middle of the field with nobody able to touch him on the way. Most defenses have never seen it and will not have a rule for it.
7v7
Room to stack on one side and still run something real on the other. The stack becomes a way of winning the matchup you choose rather than the one the defense gives you.
11v11
The standard answer to press coverage. A corner who wants to jam at the line cannot reach the stacked receiver, so a stack is how you take press away without changing anything else about the play.
How the defense answers it
Play zone and stop caring
A stack creates traffic only for defenders obliged to follow people. Zone defenders stand in areas, the two receivers arrive one after the other, and the alignment has done nothing.
Banjo it: in and out, not man and man
Rather than each defender taking a named receiver, the inside defender takes whoever goes inside and the outside defender takes whoever goes outside. Nobody has to fight through anybody because nobody is chasing a person.
Get off the line
Press is what a stack is designed to beat. Back the defenders off five yards and the free release stops being worth anything, because nobody was going to touch them anyway.
Jam the front man
The front receiver is the only one you can legally get hands on. Slowing him down slows the release of the man behind him, because the back man has to run around the traffic his own teammate just created.
When not to call it
Against zone
The mechanism is defenders being obliged to follow people. Zone defenders are not, so a stack against zone has simply narrowed your own formation for nothing.
When your receivers collide
Two players leaving the same point at speed needs spacing awareness. Below about eight years old a stack produces more collisions between teammates than free releases.
When nobody is pressing
A free release is only worth something if somebody intended to take it away. Against a defense lined up five yards off, you have paid for a benefit you were already getting.
Take it to your team
Draw your plays in the flag football play creator, collect them in the football playbook maker, and print play cards so every player knows them come Saturday.
Build a stack formation
Set the splits where you want them, draw the releases, and save it as a formation you can reuse.
Open the designerRelated questions
What is the difference between stack and bunch?
Is a stack formation legal in flag football?
Which receiver should be on top of the stack?
How do you beat a stack on defense?
Related guides
Coach Ray Carroll
Coaches 5v5 flag football from kindergarten through 7th grade in San Mateo and San Carlos, California, and built RC Football to design, teach and print the plays his own teams run.