I have four piggies - two pairs in two cages. I have a Pig Out Pouch for each cage. They are THE way to serve piggies hay! The triangle shaped openings are perfect for the piggies to stick their heads into without getting stuck. The fact that there are two holes helps the piggies share without fighting. The bags do eliminate a lot of the dust and spillage I got when I used my old metal hay racks. A lot of the dust settles to the bottom of the bag and can be dumped out when the good hay has been eaten. The metal rings hook them securely to my C&C cages. They are easy to fill and hold a day's worth of hay for a pair of piggies easily. The one difficulty I have had is one of my piggies is small enough to crawl into her Pig Out Pouch and pee and poop in there. She is able to get out again, but she loves to sit in there where she feels safe, so I have to hang the pouch a little higher and pack it full of hay to discourage this. When she is full grown, I won't have this problem anymore. The pouches are very washable and look great, too! Plus, they don't take up much floor space.