My biggest issue in the past is taking dress shirts that never travels well for me, that being said
is open-collar shirts mean I can wear a polo shirt?
I think the bigger problem may be taking your luggage to Iguazu Falls on smaller planes.
We are leaving most of our luggage in a BA hotel and just taking carry ons and then returning to the hotel and flying out the next day.
Take a look at this, does not seem to bad and fully online.
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