2-Pack 23.62" x 15.75" Water Activated Flood Bags Sandless Sandbags for Flooding Black

["Easy to use. Automatically inflates in only 3~5 minutes, maximum height reaches 3.5 inch. Expands from 0.3kg to up to 15kgs before your eyes.","Ready to use, no sand or labor needed. Requires no more storage space than a normal, empty traditional sand bag!","Environmentally Friendly! Product dissolves naturally in the ground. SAP can be decomposed by sunshine.","Not for use with salt water.","Shelf life of 2-5 years (depending on environment)","Use indoors & out. Non toxic & non hazardous."]