Fireproof security bags use strong waterproof zipper closure that gets completely covered by secure flap closure, adds storage security and carrying safety. There’s no way any flames will find their way inside and will keep the water out side of the bag.Our fireproof document bag is designed with a unique four-layer structure. Outer layer: Fire-resistant silicone coating; the second and third layers: thick fire-resistant glass fiber cloth; the fourth layer: fire-resistant and heat-resistant aluminum foil. So our bag can protect the valuables of the user and minimize damage.