Product design question
How would you improve a water bottle?
- Capital One
- Product design
- Easy
Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.
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What this question tests
Lightweight creative design exercise, common as an icebreaker, testing structured reasoning about a familiar everyday object.
How to approach it
- Clarify the target user: an everyday commuter, an athlete, or an eco conscious buyer.
- Identify the core jobs: hydration on the go, easy cleaning, and keeping drinks at the right temperature.
- Identify a real pain point: forgetting to drink enough water throughout the day.
- Prioritize a hydration reminder mechanism over purely aesthetic improvements.
- Propose a feature: a built in tracker that lights up or vibrates as a gentle reminder to drink water.
- Define success with daily fill ups tracked and a self reported increase in water intake.
What a strong answer includes
- Grounds the improvement in a specific, common behavioral problem, forgetting to hydrate, rather than a purely cosmetic change.
- Proposes a concrete, testable feature, a gentle reminder mechanism, instead of a vague 'make it better' answer.
- Sets a believable success metric, tracked daily fill ups, appropriate for a simple physical product.
Common mistakes
- Focuses only on materials or color with no functional improvement.
- Proposes an overengineered smart bottle with features unrelated to the core hydration job.
Likely follow-up questions
- How would you keep the added technology from raising the price too much?
- How would you test whether the reminder feature actually changes behavior?
- How would this design differ for an athlete versus an office worker?
More product design questions
- Design a referral system for a grocery app.Google · Product design · Medium
- Design a product to choose cheese.Capital One · Product design · Easy
- How would you design a cafeteria app for employess?Microsoft · Product design · Easy
- Design an app for the DMV (California’s Department of Motor Vehicles).Google · Product design · Medium
- Give me 10 ways that you will improve a trash can.Capital One · Product design · Easy
- How would you improve medium?Google · Product design · Easy
More questions from Capital One
Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 4: Discovery and strategy for AI products
- Chapter 7: AI UX and human oversight: design for a system that is wrong sometimes
- Chapter 14: Get the job: the AI PM interview loop