*ahem*

Shine-o-rific land
60,000 Feet Under
Officals vs. Competitors

So maybe the last two levels have only been in one other bash pack, but EvilMike's Shine-o-rific land has been in every bash since AB3 (maybe earlier). So far everyone who has organized a pack is guilty of including levels from past AB's. But I admit R3ptile included the fewest classics.