I was checking on line for prices to use the subway from P. garibaldi to Milano Centrale. My gf and myself are are arriving on the TGV from Paris. We were planning to take the subway to Milano Centrale, and walk to the Milan Hilton. At 1.50 a piece this seems like a no brainer. However, the metro website mentioned luggage tickets at 2.10 for 90 minutes. If that is per bag it might be easier and possible cheaper to take a taxi. What is this luggage ticket?

Thanks