A completely empty bag, (you can use any bag, the bag that comes with it), You can give the audience a positive look and even a glimpse, to prove that the bag is empty,
The magician then takes a full glass of wine / water / drink from the bag and drinks it.
Normal cup, real water, super magic effect
You can tell the audience, I feel this bag is weird, It seems there is something. Then, you touch the audience, The audience says nothing, Empty bag, then you take a glass of wine from a pocket, the audience must be scared.
The special performance suitable for weddings will be very interesting if you can turn out the wine glasses