To ease the creation of walls, water proof for commercial buildings, because it fills the wind into the wind and sand bags were placed in the gap in the Middle, it will become instantly waterproof-sand bags.
To facilitate the creation of the Flood for commercial buildings. It just inflate the airbag. And put sand into the gap in the middle. It will become a sandbag water immediately.
For the convenience of waterproof wall for commercial buildings. Just because the air in the alveoli. The sand into the gap in the middle. It will become a sand bag waterproof immediately.