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Suitcase 55x40x23: Everything You Need to Know Before You Buy (2026 Airline Rules, Litres, Weight and the Peli Cases That Fit)

The 55x40x23 cm cabin suitcase explained from every angle: what the numbers actually measure, which airlines accept it in 2026 (Ryanair, Wizz Air, easyJet, Lufthansa, LOT, KLM, BA and more), how many litres and how many days of clothes really fit, why weight limits matter more than dimensions, how to measure your own bag, and how the Peli ATX HC22, Air 1535 and 1510 compare inside the format.