Take a Bottle of Water
Take the usual bag on wheels. You can wheel your bag from the train stations to the hotel without any trouble. In the summer, take light-weight clothing, it can be very hot. It's time to wear you sandles and shorts! Everyone else was wearing them As everywhere I've been in France, you can always buy what you need. Do take a panoramic camera if your camera doesn't accomodate those panoramic views. Take a bottle of water with you, not many drinking fountains in those old chateaus.