"Cup" measures are handy in every kitchen, although these are metric, and come in 50, 100, 150, 200 and 250 ml scoops.  Yes, they are scoops not cups, which makes them much easier to use.

Especially useful if you are doing Slimming World, for measuring out your stipulated 150ml of red wine of an evening...

Here they are in action with the now-discontinued Measuring Spoons.