This is the effortless flood barrier that stores compactly, yet can absorb, contain and divert problem flood water in a matter of minutes. The bags are ready to be deployed without the time-consuming and back-breaking labor of filling sacks with sand. Each bag contains an eco-friendly super-absorbent polymer that activates with water to create a gel. Each bag absorbs up to four gallons of water, swells to 3 1/2” high within 10 minutes, and can be stacked to make a vertical dam. The barriers are ideal for entryways, window wells, and garages to protect against plumbing problems, severe storms, fast-melting snow, and other overflowing waters indoors or outdoors. Each bag: 24" L x 12" W. Not for use with saltwater.Six pack.