Originally Posted by
mobilebucky
If you purchase S-Bahn ticket along with your ICE ticket, all you need to do is show your online ticket to an agent if you run into one in S-Bahn (I did in Stuttgart). One thing with S-Bahn is they don't run as frequent on weekend than weekday, you might want to check and print out the online timetable at
www.vvs.de.
I am not sure your schedule going to look like that day, but you can take and early train from Munich to Stuttgart and leave late afternoon (TGV Munich to Stuttgart, ICE Stuttgart-Frankfurt for 49 Euro 1st class) 6-7 hrs should be able to cover both museums. As for carry backpack to the museum, you should be fine, I carry mine along with Tripod to both museums. As a matter of fact, I saw a guy had a tripod with dolley in Mercedes Museum.
Good to know about the ticket and the backpack situation. The early morning TGV however is just too early for me even if it has 1st class for the price of 2nd later in the day. So right now I am thinking of leaving Munich around 1130-1230 and booking a 3 hour stopover in Stuttgart. I think that should be enough to get to at least the Porsche Museum and provide some buffer time between changing between all those trains.