A bag with a netting front is shown to be completely empty.
The magician simply turns the bag around, and when displayed once more it is seen to contain a silver or gold coin.
Another variation is to start with a coin in the bag, and have it multiply.
You can even make a coin vanish with this bag.

This item is currently available through our on-line store.
Access it here: https://www.ebay.com.au/itm/142834804260