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US Patent Number: 8,113,220 B2: The Original Concrete Washout Bag. EnviroSac Ready Mix Bags offer unbeatable protection for concrete washout. There are multiple sizes of bags available. These waterproof bags offer a strength-tested and reliable design that minimizes spills during washout and easily handles excess concrete. EnviroSac Ready Mix bags are great for dumping leftover concrete from the drum, and they fold up making them convenient to store in the cab of your truck. Use the bag preferred by professionals. Bags could also be used for general construction disposal.