People will not believe their eyes!  Here is just one of the possible effects:  The magician shows the box empty.  The cover is placed in position and when it is removed, the box is magically full of popcorn, candy, a stuffed animal, or even a cake, a sandwich, or a burger!  
 
Anything that will fit inside!  And that is just half the trick!  You can even make all of these DISAPPEAR!  Yes!! This extraordinary prop works both ways! 
 
Absolutely self-working and no practice required. Measures 5" x 5" x 3.5".