I use the 2 gal. bleach jugs....MUCH cheaper than anything else out there, as we use the bleach here and the jug is a free part of that. They do just fine with 15 lb CX and on downward to little silkie bantams. The flashing cones and highways cones are just not shaped like a chicken, so the chickens tend to work themselves out of them. The bleach jugs have shoulders that cup the chicken just perfectly and they cannot flop out of them at all. Just use a wide headed nail or two...I use roofing nails...so the weight of the chickens don't pull the nails through the plastic. I can use the same jug for years upon years.