Purchased this Stainless / Glass teapot for a gift as slightly larger than most of the 750ml teapots which seem to be a common size, this one 900ml should give around 4 cups. With a stainless steel infuser too.
I tried to "flubit" this and they declined as best deal around.
"Ideal for all fruit, herbal and infusion teas. Contemporary style borosilicate glass teapot with an integral removable stainless steel infuser and lid, with an easy to hold handle. The integral, removable stainless steel infuser allows loose leaf tea to brew naturally, giving a true full flavour. Capacity: 4 cup"