Playbooks

Switch Snag is a classic Snag concept run out of Singleback Bunch TE with 11 personnel, designed as a Cover 3 beater against zone shells. From the bunch, one receiver runs a corner route to the flag, another sits down on the snag/hitch route in the void underneath the corner, and the third works an under route flat to the opposite side of the field. The backside receiver runs a deep vertical/go route to hold the far safety, while the running back releases into a check release flat route as the underlying zone-clear option. Primary progression starts with the corner route as the deep shot, works down to the snag sitting in the flat-to-hook window, and finishes with the running back check release underneath if the zone rotates hard.
Read the flat defender first, if he sinks to cover the snag route the corner route behind him should be wide open for a big gain. Watch the middle linebacker depth at the snap, a shallow drop signals man coverage or a blitz, which changes your progression to the quick under route. Identify any user-controlled lurk defender sitting in the flat to hook area, since he can jump the snag route if the quarterback stares it down too long. Look for Cover 3 cloud or sky rotation from the safety, if the corner is getting help over the top the quarterback should check down to the running back or under route instead of forcing the corner throw. Man coverage with underneath zone blitz shuts this down quickly since the snag route has no natural pick or rub to separate against tight man technique.
Diagnose the coverage shell before the snap by checking the safety alignment, if you see two high safeties rotating to three deep zone post snap this concept shuffles routes into open windows perfectly.
Attack Cover 3 by working the corner to snag combination since the flat defender cannot cover both the snag sitting down and the underneath under route at the same time.
Use the running back check release as your answer versus zone blitz looks or when the underneath defenders sink hard on the snag route.
Pair this play with Verticals or Stick from the same Bunch TE set to keep the defense honest, since both concepts share similar release points but attack different depths.
Run this on second and medium or third and short situations where a defense is more likely to sit in zone coverage, then punish aggressive zone drops with the corner route shot over the top.