Doy-pack and three-seam bags can be equipped with zip-lock. Zip-lock is a reusable plastic clasp that is soldered into packages. Zip-lock helps to hermetically and quickly seal the package with repeated use. Zip-lock prevents moisture and retains the aroma of the product. Such packages immediately become much more useful with its consumer properties as compared to usual packages; they are widely used at the producers (enterprises), as well as in the retail chains.