HydraSorber - Sandless Sandbags - Water Absorbent Flood Barrier - 4ft Long X 8in Wide - Three Pack Self-Inflating Sandless Sand Tubes - Inflate to height of 4 inches by absorbing fresh water Pack of 3 - Each tube is 4 feet long and 8 inches wide - No sand or labor required Outer cover is Heavy Duty 100% Natural Woven Jute - Inside is Eco-Friendly, Non-Toxic, Super Absorbent Polymer Durable enough to last an entire season - 100% environmentally safe and disposable Fully inflate in less than 3 minutes by submerging in water or self inflate by absorbing rain water These water absorbing tubes expand as they are exposed to water Ready to use whenever needed Lightweight and easy to use Absorbs water as it inflates to create a barrier HydraSorbers expand to about 8&#034; wide and 3 - 4&#034; high and weigh about 30lbs when saturated Are HydraSorbers re-usable?  Yes HydraSorbers can be used for an entire season and then safely disposed of in the garbage once they are no longer needed Can HydraSorbers be saved for the next year? - If HydraSorbers are kept in their vaccum sealed package they can safely be stored unti needed. When used, HydraSorbers are designed to last for a single season only. Can HydraSorbers safely be disposed of in the trash when their use is done? - Yes, HydraSorbers are completely non-toxic and safe for disposal Lay on top of cracks in cement to stop the spread of water Stop water from entering under doors Soak up standing water with expanded HydraSorber becoming a barrier to further water incursion For slow spreading water incursions, place HydraSorber at water source and it will absorb HydraSorbers are self inflating, simply add water to the HydraSorber and it will inflate to a height of about 4 inches For quick inflation, HydraSorbers can be submerged in water such as a lake, pool or bathtub and will fully inflate in about 3 minutes