Well if you are looking to pack in the most efficient ways for your Haridwar Rishikesh sightseeing tour, the first thing that you need to take under consideration is, of course, the weather.
If you are travelling in summers, then you need to know that the temperatures can really soar high and can even go up to 44C which means that you need a lot of light and cotton clothes. An umbrella, a good sunscreen and of course a good pair of glasses should also be a part of your list.
If you are travelling in the seasons of monsoons then be ready to receive a full dose of some heavy rainfall. You can carry light clothes that dry quickly and of course an umbrella and raincoats.
If you are visiting Haridwar in winters, then you must carry light sweaters. Jackets and shrugs to keep you warm and comfortable.