Your MAGIC CHANGE BAG has a secret switch underneath the handle. When you flick the switch left to right it will change and reveal a secret compartment within the bag.
Load the secret compartment with other objects of your choice and make things change or just simply make something vanish. You can also use the zipper underneath the bag to open the bag and put your whole hand thru to show there is nothing hidden in the magic bag (but there is).
Be very careful as the inside of the magic bag is lined with satin. Never appear or vanish sharp objects.