Derby Originals Supreme 4 Sided Slow Feed Hay Bag with Warranty Slow feed openings are 1.75" X 3.5" on all four sides Made of heavy-duty 1200D nylon with 174 cross stitches Velcro top closure keeps him from eating out of the top of the bag; the top bull snaps also help provide further closure Top hang straps are fully adjustable and replaceable; adjustable bottom strap with bull snap helps further stabilize the bag, if needed. Easily holds 2-1/2 flakes of hay and is perfect for use in the stable, in the trailer or at a show; bag measures 24 x 24 x 9