I took a rolling suitcase each time. I had my first vaginal and my next 2 by c-section. I packed my own gown, housecoat, houseshoes, nursing bra, shampoo, soap (I have allergies), comb, brush, etc. I also took a nursing pillow as well as my favorite bed pillows. For the baby, I packed clothes for the going home in and clothes for the picture they take before you leave, thankfully, I also packed extra baby clothes as well. I thought it was crazy at the time that I packed them, but when my first was born at 11 lbs and 1 oz. and the hospital did not have any onesies to fit him and in fact had to get special diapers to fit my half grown baby, I was glad that I did. I did the same with the next baby with the same results. My second was 10 lbs and 2 oz. and again they did not have anything to fit. My daughter was 9 lbs and 8 oz. and was able to wear what the hospital provided.
Also, you are going prepared to have this baby vaginal, but if something goes wrong or the baby doesn't come in a specified amount of time, the doctor may decide to do a c-section. In this case, your hospital stay would be a little longer.