Self-Inflating, Water-Activated, Fast Absoption, High Capacity Sandless Flood BarriersThe are made of thick canvas material, firm and durable, Super absorbent materialBarrier for heavy Rain, flooding and hurricane placing at doors and windows of house, Garden Gate, Garage Entrance, Basement Skylight.40% More Coverage and Easier to Deploy than a Traditional Sandbag.Ready to use, no assembly requiredGrows to full size of 4.5 inches high in minutesOngoing protection can last for monthsProduct informationProduct name: water swelling bagOuter bag material: canvasExpansion time: 3-5 minutesMaintenance: Air dry and store in a dry place after useProduct style: Fully sealedProduct use: flood prevention, flood resistance