J&J Professional Quality Agility Sandbags are ideal for dog competition use or training. These professional-quality agility tunnel bags are made from heavy-duty PVC-coated nylon. The sand bags are sold in pairs. Each pair includes two bags and one nylon hook and loop strap to connect them. Each bag will comfortably hold approximately 30 - 35 pounds of sand and measures 12"W x 6"D x 16"H. They are connected over the tunnel by a durable 2" wide nylon & a hook and loop strap for quick and easy assembly and adjustments. Adding sand is just as easy. The top of each agility tunnel bag opens and securely closes with the aid of a strong hook and loop attachment.