Flat Heat Seal Bags meet FDA specifications for direct food contact. Heat sealable with a crimped bottom seal and back center weld, Flat Heat Seal Bags are stronger than traditional side sealed flat bags and crinkle bags and so 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 heat sealer, or by attaching a header card.