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Silicone water bottles take up no space and travel well. Extra leg room seats in normal economy are usually narrower than normal seats due to the table and entertainment. Also no unseat storage, but it’s less of a concern because once the flight is in air can just get your bag down.
I’m 190cm tall and 150kg. I just survived an 11hr flight on Turkish air boeing 777, following an 6hr flight on a Airbus a330 in economy on both. The Airbus was more comfortable. But Dramamine is your friend.