Form must follow, and enhance, function. The overall shape and dimensions should align with your lifestyle—a slender profile for car cup holders, a broader base for stability on a desk. The lid design is paramount: a secure, leak-proof seal with a reliable sliding or twist-lock mechanism is non-negotiable for travel. Consider the drinking opening; a narrow sip lid is ideal for hot drinks and minimizes spills, while a wide mouth accommodates ice cubes, facilitates easy cleaning, and allows for adding fruit infusions. Ergonomic features like a comfortable grip or a textured surface prevent slipping.
