Get cell number of the bus conductor. In case you miss something in the bus then you can reach the conductor and ask him to keep your belonging with him.
Try to book your seat location in advance through online booking. This will give you the flexibility of getting the seat of your own choice.
When your destination is about to arrive, just be ready with your bags and count all the items. Most of the people do this mistake and they often miss their belongings in the bus.