Durable MaterialOur training sandbags are made of durable thick canvas material, reinforced with stitching, ensuring high durability, waterproof, wear-resistant and non-fading. Water resistance ensures the sandbag stays dry in situations such as flood.Elastic Band DesignThe sandbag is designed with a strong stretch polyester elastic band that is breakage resistant, ensuring a tight seal and preventing any sand from spilling. Prevents sand from escaping even during transport.Large SizeOur sandbags measure 4 feet x 6 inches, the longer size and larger caliber can hold more gravel, easier to fill sand, hold more sand, and the height after sand filling has a better waterproof treatment, to provide better waterproof and flood control.