Thank you much ISTFlyer ! So, in addition to the carry-on baggage a personal item will be allowed (40x30x15 cm, no weight restriction indicated!).

But to be honest, even TK somehow is a bit inconsistent with the information concerning cabin baggage. On https://www.turkishairlines.com/en-i...ge-calculator/ on top they write: 'One piece of cabin baggage per passenger not to exceed 55x40x23 in size and 8 kg in weight and one personal item as bag per passenger not to exceed 40x30x15 in size can be taken on board in the Economy Class.' But if I calculate the cabin baggage allowance (e.g. IST-ZRH) it then says '1 CABIN BAGGAGE 55x40x23 cm (Width x Length x Height) Maximum 8 kg + 1 ACCESSORY (No larger than camera, telephone etc.)'. For me, a 'personal item' not exceeding 40x30x15 seems to be quite a bit larger than an 'accessory' 'no larger than a telephone'. But my experience says that the personal item definition works, so I hope it will be the same with Anadolujet.