This was no Tupperware party!

A 26-year-old man was slashed on the head on a Bronx subway Tuesday morning by two crooks who stole his backpack full of the famous plastic containers, police sources said.

The man said he boarded the southbound 2 train at Simpson St. around 1:15 a.m. and that the two robbers got on at Intervale Avenue.

The duo then slashed him on the forehead and tore off his bag near the Jackson Avenue Station, the sources said. He fled the train and the duo remained on board.

He was taken to Lincoln Medical Center in stable condition.