Patented VacStrip precut roll plastic keeps food fresh up to 5x longer than traditional zipper bags. Its strip provides a path for complete air removal, allowing the vacuum sealer to achieve a complete vacuum, producing fresher food and longer bag integrity. VacStrip plastic features a third layer of "mesh" plastic fused to its interior along the center of one side, resulting in lower plastic cost compared to competing brands. VacStrip plastic is boilable, so you can toss a sealed bag right into boiling water. Dual-ply, heavy-duty 3.5mil material. Reusable. 11-1/2" roll, 20' long. 2 rolls per box.