When we say job work, it includes all kinds of job work. Labour is an integral part of job work. So many processes are involved in textile like heating, calendering, dyeing, stentering etc. Labour work cannot be segregated from job work for arriving at different rate of duty. I agree with you for 5 % rate. Packing etc. Mentioned by you also attract the rate of 5% as goods cannot be sold or cannot become marketable or we may say cannot be supplied without the processes mentioned by you. Labour and processes both are ingredients of job work. So no question of segregation for the purpose of higher rate of tax on some part of the goods. See also the definition of transaction value.