the flexible packaging composites include one or more mineral - containing layers with a thermoplastic bonding agent . in addition to the mineral - containing layer , the composite can contain one or more non - mineral containing layers , including various combinations of extruded resins , cast or blown films , and fibers . the mineral - containing layer is substantially and continuously bonded to the other layers . the polymer , fiber , and mineral containing layers can be shaped , sized and manufactured such that composite structure formed is subsequently machined to form a storage article . the composite structure has advantages including a high degree of pliability and flexibility , a minimum 37 dyne level on the surface of the mineral - containing layer ; a mineral - containing layer that is highly 86 opaque , and has a bright , white printing surface that readily accepts coating and inks , therefore , rendering it highly attractive to consumers .