Product Improvement: Redesign a Water Bottle for One User Segment
Company: Capital One
Role: Product Manager
Category: Product Design & Strategy
Difficulty: medium
Interview Round: Other
Pick a water bottle and improve it. Decide which kind of bottle and which users you are improving it for, identify what frustrates them about the bottles they use today, propose and prioritize improvements, and explain how you would tell whether the improved bottle is a success.
```hint Follow one day of use
Trace a single type of user from filling the bottle in the morning to cleaning it at night, and note each moment where today's bottles let them down.
```
### Clarifying Questions
- Are we talking about a reusable bottle someone keeps for years, or a single-use bottle sold already filled with water?
- Are we a company improving a bottle we already sell, or designing one from scratch?
- Is there a target retail price, or limits on materials (steel, plastic, glass) and manufacturing?
- What is the goal: more sales, healthier drinking habits for users, or less waste?
### What a Strong Answer Covers
- A chosen bottle type and user segment, with the reason for choosing them.
- Pain points across the whole use cycle: carrying, drinking, refilling, cleaning and keeping track of the bottle.
- Concrete improvements prioritized by user value, cost and manufacturing feasibility.
- Success metrics suited to a physical product, with the trade-offs and risks of the chosen changes.
### Follow-up Questions
- Would you add electronics, such as a sensor that tracks how much the user drinks? Argue both sides.
- How would you test your top improvement before committing to manufacturing it?
- How would your answer change if the product were bottled water sold in stores?
Overview: A beginner product improvement exercise about making a water bottle better. It tests choosing a bottle type and user segment, mapping pain points across daily use from filling to cleaning, prioritizing improvements against cost and manufacturing feasibility, and defining how success is measured for a physical product.
