That's a Bowl. Silly name, but we are stuck with it.  Good big mixing bowls with a white seal. The integrated thumb-handle gives you more control when working with such a large bowl.  

The 7.5L is the classic size for the Christmas cake, big punch bowl, etc. 

• 7.5L: 35.5cm diameter x 15 cm high
  

The 2.75L size is available separately.

I can also supply spare seals for the larger bowls.

See most of the Thatsa or That’s a Bowl range in action here (includes other sizes which are not available at the moment).