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If I were the type to get airsick, and they tried to charge me for a bag, I'd say "Oh, nevermind, this seatback works just as well"
Seatback works for me, but they'll probably charge you for the cleaning! If they wanted to charge me for the air sick bag then I'll just vomit over the flight attendant. It's not like air sick bags create high overhead costs. Pretty soon they'll start charging you for "breathing their air."