We've tried a lot of treat bags, and this one is our favorite by far. It comes in several colors. You can choose your favorite when you pick it up. It has lots of great features:
The hinge stays open for easy access to food or toys.
The belt is detachable and adjustable or you have the option to just clip it onto your belt or pocket.
Key ring to attach keys, clicker, or a whistle.
Order your treat bag online, and pick it up next time you come to class.
Price includes sales tax.