Features: swelling flood protection bag before use, small size, light weight, storage, easy to transport. Compared with traditional sandbags for flood control during emergency greatly reduce the time and manpower, and the other flood rescue more efficient. Swelling bags are environmentally friendly products, non-toxic, harmless, tasteless, non-polluting. Natural degradation. Performance: 1, swelling bag absorbent material is a polymer chemicals, can quickly swell after absorbing 80 to 100 times. 2, before the swelling water absorption of 420 g bag, immersed in the water to the water-absorbent bag is expanded to 18 to 20 kg 3 to 5 minutes. 3, after the swelling absorbent bags inflate bags can weigh up to 150 kilograms of weight bearing.