100
xkcd #3061: Water Balloons
(xkcd.com)
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When my dad was a kid he used to fill up the empty bags bread comes in then climb up on the fairly flat roof of a shed and throw them at his twin sister. I’m sure those were at least a liter, probably more.
Although thinking about it, 200 ml seems small. I would think I’ve usually been more in the neighborhood of 500 ml when filling them.