These 4" x 6" 3 Mil co-extruded vacuum seal bags with black back are engineered for demanding commercial environments where product integrity and shelf life are critical. Manufactured from multi-layer co-extruded film, these commercial vacuum bags deliver excellent strength, clarity, and oxygen barrier properties, helping to preserve flavor, color, and freshness of food and non-food products. Supplied 1,000 per case, they are ideal for processors, packers, and distributors who need consistent, reliable performance with every seal. These vacuum seal bags are specifically designed for use with commercial chambered vacuum machines, not at-home use Foodsaver-style external suction machines. The 3 Mil thickness offers a strong, puncture-resistant construction suitable for meat, cheese, poultry, seafood, and prepared foods, as well as industrial and medical components that require controlled packaging.