I've recently been on holiday for a week to Paphos, Cyprus and took a quick photo of my carry-on bag before I properly unpacked everything. My bag is a 12 litre Deuter Race X rucksack, which I initially purchased for cycling and running with. It was perfect for my travels as 1) it's very light and compact 2) holds lots for its size 3) lots of interior pockets to keep valuables safe and 4) good for visiting hot countries due to the back design, so you don't get too hot and sweaty when wearing it.
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The Grapes of Wrath by John Steinbeck
Book of Sudoku
A5 Leuchtturm notebook
SoundMAGIC E80 headphones
Passport and boarding pass
All-inclusive wristband from hotel
Bottle of water - already in recycling.