Extra ticket for luggage on metro

In most of Europe these days, one uses an ATM (bank machine, and you should only use machines owned by banks) to obtain local currency rather than an exchange booth or staffed counter. I have not been to Prague recently, but it's common to see ATMs in bus and train stations in other cities. If you don't see one--or if what you see is not a bank ATM, but some other type of (rip-off) machine, you'll certainly find many ATMs along the main streets.

This web page provides reliable-sounding information about Prague ATMs.

your 72 hour ticket includes any luggage you may have. I am pretty sure the bus from Munich goes to Hlavni. there are exchange p[laces at Hlavni but not sure about florenc been a while since imwas in there but both places have atm's

Thanks Unclegas

Theoretically, you need a separate ticket to carry luggage on the metro. However, I have never bought a ticket for luggage and I have never seen it enforced.

However, the ticket inspectors do seem to target people with suitcases, as they are more likely to be tourists, who frequently don't understand the system and have a higher chance of not having a valid ticket. For instance, I was "kontrolled" yesterday as I made my way home from the airport, and I noticed that other person who'd been stopped was a tourist.

They have recently installed new ticket machines which will accept a contactless credit or debit card, meaning that you can buy tickets at either Florenc or Hlavni Nadrazi without using cash.

Marcus they have contactless ticket machines on some trams now as well , the 18 and 22 in think (definitely the 18) and many tourists are getting confused with them and the ticket validation machine as they look so similar.
http://www.dpp.cz/en/now-paying-for-fares-in-prague-trams-is-also-contactless/
there were a few threads on Trip Advisor about them and many locals and regular traveller like me did not know of them and there were complaints that the inspectors were giving no lee way to tourist who where confused by them especially on very busy trams. I actually wrote to the DPP and asked if the inspectors could use some sort of discretion when on trams with these machines (Yeah I Know inspectors and discretion don't exactly go together) I got a standard reply saying they would look into the matter.

I remember looking at this very issue when I was in Prague in 2013, and I believe there is a size threshold below which you don't need a ticket for your luggage, and my regulation carryon bag was below it.

Per the metro website on fares,

Free transport applies to luggage up to and including 25x45x70 cm

70 cm x 45 cm x 25 cm is about 27½ In. by 17¾ In. x 9.84 In. That's a pretty big bag. The linear inches is 55; the maximum linear inches for checked baggage on United or Lufthansa is 62 inches. So if your airline carried as check baggage, you probably don't need a baggage ticket.