 Lassi is more popular in Punjab and certain regions of north India, while chaas (known by various named) is popular in all other parts of the country.Vendors have come up with several proprietary products and standardized flavours of chaas which are produced on an industrial scale and sold as bottled drinks.The best-seller among such brands is Amul's "Masala Chaas," which has standardized several traditional flavours for the mass bottled-drink market.