A detailed product design sketch of a black travel mug with a red band, dark lid, and a flip-top opening, on a white background with pencil lines.

A beverage container sketch which must be less than 3 inches in diameter to fit in a car cup holder. It can hold either hot or cold liquid (or both!). It can only use 3 colors (but can use fewer). It should have space for a brand or company logo. It must not leak. It should be easy to operate with one hand. It should hold at least 12 ounces of liquid. It must be tactilely interesting. See more