For instant protection as on-site barrier walls simply submerge the StormBag in freshwater - the bag will expand from 16 oz. to about 33 lbs. in 3 to 5 minutes. The StormBag requires minimal storage space and is a light, compact, easy to carry and deploy alternative to traditional sandbags. When an emergency strikes, timing is everything. StormBag is a quick, easy, and cost-effective product in an emergency situation because, with the StormBag, all you do is add water.