I do not believe that the bags from GT Zip are considered laminated bags, but I can say the 4 mil do hold scent and oil. I know this goes against everything you all have said and most wont believe it, but I have used them, Pit bull obviously is using them, and Richard from 152nd st baits has used some of them. They do hold up. Maybe they are laminated. They dont advertise that they are so I assume they are not and refused to purchase them until I saw richards post saying they held. The labels can have a hard time sticking to them sometimes. That is a drawback. But I have found if you press your labels on a firm flat surface before you bag they tend to stay. Take this for what its worth.