International carry-on size: the one bag all 34 airlines accept
The Cabin Bag Index 2026: the US 22 x 14 x 9 in carry-on is too big for 21 of 34 airlines, 13 of them charge for a cabin bag on their cheapest fare, and the one bag accepted everywhere is 50 × 35 × 20 cm, 7 kg.
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