He waited in a queue of nearly a thousand people for a bus to the Union Buildings to view the body of former president Nelson Mandela, who is lying in state for the second day.
On Wednesday, Vavi also waited in the queue, along with former trade unionist Jay Naidoo.
On Thursday, Vavi spoke to people in the queue as he waited.
The queue stretched nearly one kilometre.
Mandela died at his home in Houghton, Johannesburg, last Thursday, at the age of 95.
The official memorial service was held at the FNB Stadium, in Soweto, on Tuesday, and was attended by about 100 current and former heads of state and government.
He will be buried in Qunu in the Eastern Cape on Sunday.