For formulae, I usually put them in a lock and lock container rather than tin (Coz of weight). I will put some of the fm in milk dispenser in my haversack to bring with me in the flight.l while the rest check in. Diapers, clothes etc, I will put them in a vaccum pack and compress them so as to save space.
As a kiasu mother, I had brought boiled water to check in before too when they were less than a year. For check in: medicine in case, handkerchief, wet wipes, diapers, clothes (more), hats, foldable umbrella, biscuits, bottle detergent
For hand carry: spare clothes, handkerchief, wet wipes, thermal flask with hot water, milk dispenser, milk bottle, toys, pillow etc
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