What is the luggage limit on a day tour to Machu Picchu?

You cannot enter Machu Picchu with large backpacks or suitcases, only with a handbag or small backpack. If you will only be there for one day, you should take water, a hat, sunglasses, and a jacket for the cold in the morning. Only snacks are allowed and you cannot eat inside the wonder (there is a restaurant at the entrance).