The Perfect Udder® Bag Caddie turns any 4, 3, or 2 Liter Perfect Udder® bag into a rigid bottle for easy handling at the calf. The spout of the bag locks into place to provide rigidity to the nipple or Nipple DXC (shown in picture) so your hands can be free to restrain the calf or guide the nipple into correct position. The shoulder strap supports the assembly until you are ready to let the liquid go. The new Bag Caddie design protects the contents of the bag and is easy to clean afterward.