Made of a tough poly for durability with a mesh bottom that allows dirt to escape. Hangs on the fence or in your trailer. You can load it with one hand, and the top flap closes so hay doesn't come out the top. No-spin, adjustable back strap keeps the bag in place. Feed squares are 2-1/2" | Cashel Top Load Slow Feed Hay Bag in Red | Size 24" x 20" x 9"