Laminated Heavy Duty Heat Seal Bags meet FDA specifications for direct food contact. These bags are heat sealable with a crimped bottom seal and back side center weld, made with a stronger material than our basic Flat Heat Seal Bags. Laminated Heavy Duty Heat Seal Bags are stronger than traditional side sealed flat bags and crinkle bags and are ideal for 3 dimensional products like cookies and candies. Usable space on the bag is less due to the flow seal (crimp) at the bottom. The bags can be sealed closed at the top with a crimp sealer, a poly hand sealer, or by attaching a header card.