A filling slit is formed in a first panel of web material of a flexible pouch enclosure formed from the first panel and an opposing second panel of the web material and having a resealable closing assembly having interlocking male and female members joined to a flange. After the flexible pouch enclosure is at least partially filled with a product through an opening in the first panel of the web material that is created by the filling slit, the filling slit is closed by sealing the first panel to the flange of the resealable closing assembly.