This is from half a box! 21 mugs from 10 kg ( (all scrap was reclaimed). Polar Ice porcelain double the price of others. Why use it? Because it is so plastic that you can make more pieces, many more, enough to more than pay the extra clay cost. And you can charge more for each piece. These have a weight-to-capacity ratio of 1.09. That means the mug itself is lighter than the weight of water it can hold (each 1 gram of fired porcelain can contain 1.09 grams of water). This is much better than most other clay bodies.
Plasticity (in ceramics) is a property exhibited by soft clay. Force exerted effects a change in shape and the clay exhibits no tendency to return to the old shape. Elasticity is the opposite.