The Packers are a very natural fit for United fans.
Both storied teams with a loads of success through the years.
One of the oldest teams in the NFL - One of the oldest teams in English football.
Working class origins - Indian Packing company - Lancashire and Yorkshire railway.
Record 13 Championships - Record 20 League Championships.
Old Trafford - Lambeau Field.
Green and Gold.
Bart Starr, Paul Hornung, Jim Taylor - Sir Bobby Charlton, Georgie Best, Denis Law.
Don Hutson - Duncan Edwards.
Earl Lambeau & Vince Lombardi - Sir Matt Busby & Fergie.
Cold weather.
Brett Favre - Eric Cantona.
Bears - Liverpool.
etc.
Per you set of requirements.
Cleveland teams are disqualified by default - Not in Cleveland.
A bit of history - History galore.
Championships aren't exactly a priority but i need an era to brag about or a great team or something, not a useless franchise - Done.
A permanent team (not trying to support a franchise that gets relocated to Alabama or Oklahoma) - Never moving out of Wisconsin.
A good city - Err...
I already support United and The Heat, I'm not trying to support a villain in every sport - One of the most respected franchises around. Build through the draft, very little controversy, die-hard local fanbase.
Uniforms - Subjective opinion.