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hat’s right, no sand needed and they fill up in a few minutes. Floodbloc is the ultimate recyclable sandbag for disaster situations. Its capability to be rolled flat greatly reduces transportation costs. “An emergency/first or rapid response flood mitigation product FbBag™ has been created to address the needs of first or rapid response situations. FbBag™ can be used in the home, in the food and agricultural industries, hospital arenas and construction sites.”