I do not want to bring oversized stuff, but just a standard IATA cabin trolley which has travelled on probably 100 different airlines with no problems. Problem is that suitcase producers tend to produce according to IATA standards, particularly when it comes to the length (55 cm vs. 50 cm). I have three Samsonite/Rimowa trolleys what all have different "heights" and "widths" (which is what really matter for the overhead bins), but "length" is somewhat standard. Maybe I should opt for psychological warfare and bring on the Lufthansa branded one