coin in hand

Hello, I once saw a trick on penguin were a coin was thrown up in the air and then transformed into a tiny bag in the size of a coin which then contained the coin. Unfortunatley I forgot how it was called. Does anyone know it by chance?

Looks like the supplier needs to stock up, but there isn't anywhere that has this in stock, right?

I am doing a coin trick that requires be to clip a coin behind my hand while showing that my palm is empty, but my hand looks very stiff. Any tips on making a back clip appear natural (images if possible)?

I have an idea for a trick but wanted to check before spending hours mastering it: 1. Show palm of hand is empty while pinching coin between fingers behind it. 2. Flip hand over to show back of hand is empty while opening fingers to allow coin to roll into palm. 3. Reveal coin.

In this video, timon krause performs a routine in which he asks allison to place a coin in one hand or the other, and is able to tell which hand each time, but for the final round, he removes a prediciton from his pocket. You can see the ink through the back of the paper and it reads 'GHT GHT'...