I have two pyrex bowls with lids that I got at my local store. The smaller of them is probably 2-3 cups. They are a little spendy at the outset but they are sturdy, easy to clean, microwavable, and won't crack or stain like plastic.

Here's a set on Amazon: https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.amazon.com/Pyrex-Storage-Clear-Orange-Pieces/dp/B00O1FPRTO&ved=2ahUKEwihuvzS15jgAhVlHTQIHYj-CC4QFjAAegQIAxAB&usg=AOvVaw0d6OK4HPyrXRCwhZjO5s8l