There are two ways to make one laminated bag: Wet-bond laminating and Dry-bond laminating. Wet-bond laminating is a laminating process where a coated adhesive containing volatile solvents is pressed between the two substrates to be laminated. Since the adhesive still contains volatile substances that must be allowed to escape, then at least one of the laminate materials must be porous. A common material used is paper. What Uni-pak using is Dry-bond laminating.