You have two people up on stage competing against each other to inflate their tube the most

They have 5 seconds to blow into their tube, once the 5 seconds is up, you check their tubes and see how much they have filled it up 

Having done this you then introduce a third tube which is your tube, you tell them that you can beat their attempts with just one breath!

And you do!

You will receive a set of instructions and 3 x 10M of different coloured material that has been specially manufactured to make this possible.