For same day Badrinath Kedarnath travel by helicopter, passengers are restricted to bringing only one small soft bag or duffel bag, weighing a maximum of 2 kg. Suitcases and any other types of luggage, including hard-case bags, are strictly prohibited inside the helicopter for safety and space considerations. It's important to note that the allowed baggage is based on the condition that the passenger's body weight matches the information provided at the time of booking.