Quick Dam  Water Activated Flood Bags 1ft x 2ft, 20-Pack Water Activated Flood Bags, Rated #1 in Flood Control Grows to 3.5in high in minutes, just get them wet Use to control, contain & divert flood water Ready to use, no sand or labor needed Compact & Lightweight, stores away until needed Use to protect doorways, garages, erosion control & more Use indoors or out Be Prepared & Be Protected- Keep Quick Dams on hand Units grow to: 12in width x 24in long x 3.5in tall Do NOT use with salt water, chemical reaction causes deflation