2 checked bags are permitted with Turkish Airlines if you’re flying to a destination that uses the piece concept.
In the Economy Class, each passenger is allowed to bring one piece of carry-on luggage that is no larger than 23x40x55 and no heavier than 8 kg, as well as one personal item that is no larger than 40x30x15. Turkish Airlines recommends a maximum weight of 4 kilograms for personal items.
In Business Class, the free baggage allowance is 2×32 kilograms. Turkish Airlines requires that the overall length, width, and height of any component be no more than 158 cm.