it's forbidden to ride the metro with suitcases/baggage.
Then they will have to change the rules, at least for line 2. In Hamburg, when they built the S-Bahn from Ohlsdorf to HAM, you'll see many people coming back and forth anywhere with luggage in the train. Then again, the S-Bahn in Hamburg (and in Berlin), while built like a metro, is legally considered heavy rail, while the U-Bahn (the actual metro) is legally considered a tram. But I also remember that there were no restrictions about luggage in the U-Bahn unless it was something extremely oversized (and these same regulations were valid for all companies running their services under the HVV banner, like Hamburger Hochbahn AG, S-Bahn Hamburg GmbH/Deutsche Bahn AG, etc.).
I could've saved myself 35 Dollars for the taxi ride from Vía España to PTY. When I took the taxi from PTY to Vía España after I arrived, I also paid 35 Dollars, so I would've saved a total of 70 Dollars and instead paid 35 Cents per ride if that line was operational today. My hotel was about 400 metres or so away from Santo Tomás station, plus I could've switched lines without paying the entire fare (or at least I would've just paid the difference if that line charges extra to/from PTY). Even the ride with one of the Corredores buses would've saved me a lot at 75 Cents per ride (but I believe the Corredores lines do not allow luggage either, so as of right now, you MUST pay for a taxi).
Sometimes the only thing more dangerous than a question is an answer. - Ferengi Rule of Acquisition 208