For the transit trip to Hawaii purchased a Lowepro backpack at the exact size limit for carryon baggage and everything heavy (scope, cameras, lenses,laptop and books all went in that. Only thing that didn't wa the tripod with the head detached which was cabon so was in the suitcase. I then easily packed clothes for 9 days in a small suitcase that only weighed 15kgs. The backpack was 16kgs!
Only drawback is if you have to wait at the airport, carting around a heavy back pack is a pain.
Malcolm
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