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by ghaff 2830 days ago
A ~40L travel backpack like [1] is legal carryon (and is probably actually a bit more adaptable for overhead space than a typical rollaboard) along with a small laptop bag or other "personal item." It's what I mostly use to travel all over the world for weeks at a time. This is on a regular airline--typically United. I get free checked luggage but rarely take advantage.

[1] https://www.osprey.com/us/en/product/porter-46-PORTER46.html