I have some good news for you. If you fly with Turkish Airlines your luggage won’t be a burden to you. Until your last moment in Istanbul you can enjoy your travel because you can drop your luggage at the Miniport offices, which are located in Taksim and Istanbul Ataturk Airport
The number of domestic flights in Turkey has been increasing in recent years because of the new airport constructions of the Turkish government and recent investments of the private airline companies. A flight ticket can be occasionally cheaper than a bus ticket owing to the promotion campaigns of the airlines.