When joining a 500-hour Yoga Teacher Training Course (YTTC) in Rishikesh, it is important to pack appropriately to ensure you have everything you need for a successful and comfortable experience. Some important items to consider bringing include a yoga mat for hygiene purposes and use during practice, comfortable clothing that allows for easy movement during Yoga, and warm clothing for the cooler mornings and evenings. It's also a good idea to bring a refillable water bottle, toiletries, sunscreen, and any necessary medications.