In Istanbul, there are many factories that produce cement sacks. The sacks are made of a sturdy paper and are used to hold cement during construction projects. The manufacturing process is quite simple. First, the paper is cut into the correct size and shape. Next, the bottom and sides of the sack are glued together. Finally, the top of the sack is glued shut. The cement sacks produced in Istanbul are of high quality and are used all over the world. If you are in need of a cement sack, be sure to purchase one from a reputable manufacturer in Istanbul.