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I don't know about being your "client"; that implies payment for service and a commitment to your design process. Perhaps instead you should ask people to list problems that they would like solutions to.
Here's a short list, off the top of my head:
1) When I treat water, I need to know that the water in that bottle has been treated, and how long ago (because it's not safe to drink right away).
2) When a water bottle isn't nearly full, the water makes a sloshing noise that's really annoying as I hike.
3) Trekking poles have a spike on the end. Sometimes you don't want the spike, so you put a rubber cap over it. Sometimes you want to switch back and forth frequently, but that's a nuisance. Why not have a rubber cap that lets the spike push out when you push hard, and then lets the spike retract?
4) If I'm cooking by headlamp, when I look up to talk to my wife the light blinds her. Design a shield that covers the light when I look up, but not when I look down.