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> What constitutes as payload? Because 29 tons in itself is quite a lot. 'nauts, their food, water, clothing, personal items, scientific equipment, tools - these are okay, but stuff like seats, or carbines, webbing or whatever, are those counts as payload I wonder.
For all rockets in picture excluding Shuttle and Starship it is just mass of that thing that lies on top of third stage.
For Shuttle it is different, because Shuttle itself both a rocket and a "payload". So, I guess it is payload that can be delivered by Shuttle (it had bay), maybe also including weight of some support equipment in cabin, but not all, because Shuttle had fixed configuration, and most of plane is not payload but reusable spaceship too. This also may explain why it is so low, although technically Shuttle was pretty powerful, and plane part was 100t or such.
Don't know how Musk counts his payload (with reusable parts or not?). Considering that number is too round (100), it is not precise number anyway. I guess it includes spacecraft part (not like Shuttle), otherwise it is too large number to be real.