Self-Inflating Jute Sand Bags, 14" x 23"This bag automatically absorbs water and expands in contact with water. By taking advantage of their properties of automatic expansion due to the super water absorbent materials, people can fight water with water and control flooding with the fastest speed in emergency. It saves time and manpower effectively. Inflates to 40 44 lbs when submerged in water for 3 5 minutes.