Playbooks

Mesh Post is a man beater out of the Shotgun Cluster set that pairs a classic mesh combo underneath with a deep post breaking off the backside. Both cluster receivers cross the formation at the same shallow depth to rub off man coverage, while the inline receiver from the bunch stack pushes vertically before breaking into a deep post that stresses the middle of the field. The outside receiver at the bottom runs an underneath drag away from the mesh point as a checkdown, and the backfield player releases as an outlet to the flat if the pocket collapses. The primary read starts with the post shot off play-action leverage, then works down to the mesh crossers if the safety rotates over the top, using the drag as the final checkdown.
Man coverage is the biggest vulnerability here since the mesh crossers create natural traffic that forces defensive backs to fight through picks, so look for man alignment with no safety help over the post. Cover 3 with a single high safety leaves the post route in a soft spot between the deep third defenders, so if you see a one high shell pre-snap, expect the quarterback to take a shot there immediately. Cover 2 shells with two deep safeties squeeze the post route hard, forcing the quarterback to check down to the mesh crossers or the flat, so sit a linebacker or safety in that intermediate zone to bait the throw. Watch for a user controlled defender lurking in the shallow crossing lanes since that is the easiest way to jump the mesh combo and create a turnover if the quarterback stares down the crossers too long. Overload blitzes from the boundary can beat this concept before the mesh has time to develop, so if the offense has shown quick game out of Cluster, disguise pressure off the edge to force a rushed post read.
Take a pre-snap look at the safety shell before the snap because a single high safety tells you the post has a soft window over the middle, while two deep safeties usually means you should work the mesh crossers instead.
Use motion across the formation to identify man coverage; if the defender follows across the field, throw the mesh concept with confidence since the natural pick action will spring someone open.
Hot route the backside drag receiver into a deeper dig if you are facing zone heavy defenses, since the shallow drag will simply sit in a linebacker's lap against zone drops.
This play works best on second and medium to third and long when the defense is more likely to play off coverage or zone drops, giving the post room to sit down behind linebackers and in front of safeties.
Pair this call with Mesh or Mesh Whip earlier in a drive so that defenses start jumping the crossers, then dial up Mesh Post to hit the deep shot when a defender bites on the shallow routes.