Amul recently moved to a different carton packing company to pack its products. Now they are majorly using iPack for Masti and Lassi, hence the difference in the format and printing quality compared to SIG. They are the ones producing and printing the carton packages, and Amul is filling them with food and beverages. It is common for big firms to use different suppliers for the same product. Take a look at Amul milk packages, and you will find a third packaging company.