FloodSax Sandless Sandbag, Water Absorbent Flood Barrier, White, 19"L x 20"W (5 Pack) 19 x 20 Inches sized flood bag . Vacuum sealed with 10 yr. shelf life. Indoor and outdoor use (fights flooding disasters and home/ commercial liquid damage) Works in just 3 minutes. Compact and lightweight. Superior flood wall barrier protection and absorbent pad. Add freshwater and each flood bag inflates from 1 lb to 50 lbs. (absorbs up to 5.8 gallons) Salt water barrier compliant (activate with freshwater before coming into contact with saltwater). Works up to 3 months after activation. Superior engineering - 9 section design for ultimate stackability. Made of industrial grade super absorbent polymer crystals and interwoven natural fills Indoor water damage prevention: Ideal for leaky toilets, water heaters, internal sprinkler system breaks, aquarium leaks, broken pipes, leaking appliances, basements and more Flood protection: Fits well against doors, sliders windows and grates.