In this pressure the Packers show a 5 man rush pre-snap with a LB walked up on the left. However, the right Rush LB drops out. The coverage is a Cover 3 concept with a 4 man rush. Video can be seen here.
This package isn't limited to only 4 man rush pressure. The 5 man rush package can give the defense well designed blitzes coupled with skilled players dropping into coverage.
The Packers use an overload blitz concept with Cover 3 Fire Zone behind it to create a 5 man pass rush. The hybrid personnel allows the Nickel to rush the QB and not have any true defensive linemen drop into coverage. Video can be seen here.
This type of personnel also makes overload blitzes like Dick Lebeau's Triple Inside Fire Zone and Safety Gut Fire Zone (both utilize 2 dropping DE's) more realistic pressure options.
The Packers also have a 1 down lineman (Psycho) package from their odd front. The pressure possibilities from this package are basically endless.
Here the Packers shuffle the Right Rush LB down and have him long stick to the opposite side of the center. The blitz is a variation of the NCAA blitz with all 3 linebackers rushing on the same side. The Nose loops for contain opposite the blitz while the Left Rush LB drops to the 3RH. The coverage is a traditional Cover 3 Fire Zone with a dime personnel secondary. Video can be seen here.
With offenses continuing to put more speed at the skill positions and spread the field I believe defenses will continue to develop answers like the psycho package to match up. More information on this trend is available on Brophy's Blog in a post here. Also more information about Dom Capers and his defense can be seen in his 1997 Carolina Panthers playbook.