I have a flight from the United States to Istanbul, and I will stay there for a couple days. Then I'll go to Venice from Istanbul and after 11 days I will leave Italy from Rome. My return flight from Rome to the US has a 2.5-hour layover in Istanbul.
If I leave my luggage with baggage custody at the Istanbul airport and check in one bag in Rome, can I check in another baggage, which will be in Istanbul airport, during the layover? Does the airline allow me to check another bag in Istanbul?