Yet another waste of the Earths precious resources in the name of profit for the greedy multinationals.
Mind you as a kid I remember getting a plastic submarine in the rice crispies( I think) which you filled with self raising flour.
When you put it in a bowl of water the CO2 produced raised the little sub to the surface.
Kept me amused for hours, it did!

Anyone else remember that one, or am I just showing my advanced age?
with Metta